Resource library

Every free source this manual cites, grouped by subject, with who publishes it and what it is for. Each link was opened on the date shown.

Every free source this manual cites or relies on: 171 pages from carmakers, federal and state agencies, standards bodies, trade groups and a few practitioners and publications. Each entry names its publisher, and the line after it says what we used it for. A carmaker's or a trade group's page describes its own products or its members' view; we say so wherever we cite one.

Verified: every link was opened on 2026-11-01. Next check: 2027-11-01. Pages move and rules change; if a link here is dead or a figure is out of date, tell us at guides@learnthings.online.

Nothing here is for sale through this manual, and no link carries a referral or tracking code. The paid car-care and service-advisor courses we compared while planning the manual are not listed.

Schedules, oil, fluids, filters, batteries, hybrids and electric cars

• Check Your Number, Because 3,000 Miles May Be Too Early to Change Your Oil. California Department of Resources Recycling and Recovery, CalRecycle (agency, state). State agency statement that 3,000 miles is outdated for most cars.
• Used Oil Recycling Program. CalRecycle (agency, state). Where Californians take used oil.
• Managing, Reusing, and Recycling Used Oil. US Environmental Protection Agency (agency). Consumer used-oil handling.
• Household Hazardous Waste (HHW). US EPA (agency). General route for oils, batteries and car chemicals.
• Engine Oil Licensing & Certification System (EOLCS). American Petroleum Institute (trade association, oil and gas industry; runs the oil licensing program). What the API marks are and how they are policed.
• API's Motor Oil Guide (shelf card PDF, "2025-04-21 EOLCS Motor Oil Guide"). American Petroleum Institute (trade association). The donut, starburst and shield, and current categories with dates.
• API Oil Categories (web page). American Petroleum Institute (trade association). Background only.
• Maintenance Schedule. Toyota Motor North America (manufacturer). Where Toyota owners find their schedule.
• Warranty & Maintenance Guide 2025, Camry (0050525WMGCAM, printed 3/24). Toyota (manufacturer). A full real schedule with normal and special conditions, hybrid items and warranty terms.
• Keeping Maintenance on Schedule (Maintenance Minder). Honda Canada (manufacturer, Canadian market). How Honda's oil life system works and its limits.
• A/0 type Maintenance Schedule (PDF). Honda Canada (manufacturer, Canadian market; km). Minder codes and exceptional-use intervals.
• Oil Change Services (Engine Oil Life System FAQ). Chevrolet, General Motors (manufacturer). GM's oil life system rules and its 3,000-mile statement.
• Engine Oil (support). Chevrolet, General Motors (manufacturer). Confirmation of the annual minimum.
• Ford App Oil Life Service Reminder Frequently Asked Questions. Ford Motor Company (manufacturer). Ford's Intelligent Oil-Life Monitor limits.
• Maintenance Schedule (VIN lookup). Ford Motor Company (manufacturer). How to get a Ford schedule by VIN.
• Scheduled maintenance services (2026 Sonata, DN8, en_US owner's manual). Hyundai Motor Company (manufacturer). A broad severe-use definition and oil life system rules.
• Normal maintenance schedule (2025 Sonata, DN8, en_US). Hyundai (manufacturer). Normal intervals.
• Normal maintenance schedule (2026 Tucson Hybrid, MX5aHEV, en_US). Hyundai (manufacturer). A hybrid schedule and a "no service" transmission example.
• Automatic Transmission fluid (2026 Tucson, NX4a, en_US). Hyundai (manufacturer). Fluid color is not a reason to replace.
• Checking the engine oil level (2026 Tucson, NX4a, en_US). Hyundai (manufacturer). One maker's dipstick procedure.
• Checking the coolant level (2024 Kia, BDm, en_US owner's manual). Kia Corporation (manufacturer). Manufacturer hot-cap warning.
• Vehicle Maintenance. Tesla (manufacturer). An EV maintenance schedule.
• Maintenance and Safety of Electric Vehicles. US DOE Alternative Fuels Data Center (agency). What hybrids, PHEVs and EVs need.
• Batteries for Electric Vehicles. US DOE AFDC (agency). Battery types and end-of-life.
• Battery Durability and Warranty Requirements for Model Years 2027 and Later. US DOE AFDC (agency summary of an EPA rule). The federal battery warranty as adopted in 2024.
• EPA Rescinds Greenhouse Gas Endangerment Finding, Repeals All Vehicle GHG Standards. Law firm client alert via JD Supra (practitioner). Context for the federal battery warranty status.
• All-Electric Vehicles. fueleconomy.gov, US DOE and EPA (agency). EV battery life estimate.
• Keeping Your Vehicle in Shape. fueleconomy.gov (agency). Which maintenance affects mpg and which does not.
• FOTW #1190, June 14, 2021: Battery-Electric Vehicles Have Lower Scheduled Maintenance Costs than Other Light-Duty Vehicles. US DOE Vehicle Technologies Office (agency). Maintenance cost comparison.
• Car Care Tips. Car Care Council (aftermarket industry group, part of the Auto Care Association, which represents parts and service businesses). Aftermarket intervals to compare with manufacturers.
• Vehicle Systems Overview. Car Care Council (aftermarket industry group). The council's own description of its schedule.
• Car Care Guide. Car Care Council (aftermarket industry group). Guide description.
• When, Where, How and Why to Change Your Vehicle's Oil (press release, July 12, 2016). Car Care Council via PR Newswire (aftermarket industry group). The council's oil-interval framing.
• AAA Spills the Truth on Oil Changes (June 6, 2017). AAA (membership org; runs an Approved Auto Repair program). Synthetic vs conventional, and distrust of shops.
• Synthetic vs. Conventional Oil Research Fact Sheet (June 2017). AAA (membership org). AAA's interval advice.
• Roadside Breakdowns Preventable with Proper Maintenance, Finds AAA (published 2015-10-07). AAA South Jersey, republishing an AAA national release (membership org). Skipped-maintenance figure and battery testing advice.
• AAA car care tips for extreme heat. AAA Oregon/Idaho (membership org). Battery heat failure and life.
• The Silent Summer Threat: How Heat Wrecks Your Car Battery. AAA South Jersey (membership org). Plain-language heat mechanism; promotes AAA's own battery service.

Tires

• Tires: TireWise (Tire Safety Ratings and Awareness). National Highway Traffic Safety Administration (agency). Federal consumer guidance on pressure, tread, rotation, TPMS, aging and spares.
• 49 CFR 571.138, Standard No. 138: Tire pressure monitoring systems. eCFR, Office of the Federal Register / NHTSA (regulation). The legal TPMS warning threshold.
• 49 CFR 574.5, Tire identification requirements. eCFR (regulation). The legal definition of the date code.
• 49 CFR 574.7 and 574.8, tire registration information requirements. eCFR (regulation). The dealer's legal duty on registration.
• Tire Care Essentials. U.S. Tire Manufacturers Association (trade association). Tire makers' consumer care rules.
• Care and Service of Passenger and Light Truck Tires (manual). U.S. Tire Manufacturers Association (trade association). The industry position on tread minimum and service life.
• Replacing Your Tires? U.S. Tire Manufacturers Association (trade association). Matching rules for replacements.
• Tire Registration, and Tire Recalls. U.S. Tire Manufacturers Association (trade association). How to register tires and check tire recalls.
• When Do I Need New Tires? Michelin North America (manufacturer). One tire maker's age and tread guidance.
• Replacing tires (tire knowledge). Continental (manufacturer; global English page). A second tire maker's age rule.
• Tire Replacement. Ford Motor Company (manufacturer). One automaker's 6-year rule.
• How often should I replace the tires on my Ford? Ford Motor Company (manufacturer). Ford's other, condition-based page.
• Important: use of compact spare tire (2025 Sorento owner's manual, en_US). Kia America (manufacturer). One maker's temporary-spare limits.
• Tread Lightly: Worn Tires Put Drivers at Risk. AAA (membership org). Wet-braking test results at 4/32.
• AAA All-Season Tire Testing (report). AAA (membership org). The method and state-law context.
• Tires Don't Have to Be Worn Out to Lose Traction in Wet Weather, Study Shows. Consumer Reports (nonprofit consumer testing org; trade press). CR's quarter and penny guidance.
• California Vehicle Code section 27465 (tread depth). California Legislature (state law). An example of a state legal minimum below 2/32.
• 49 CFR 393.75, Tires (Federal Motor Carrier Safety Regulations). eCFR (regulation). The only federal tread minimum, for buses and trucks.

Brakes and steering

• About the brake system. Chevrolet / General Motors (manufacturer). An owner's list of brake warning signs.
• Chevy Certified Service: Brakes (Q&A). Chevrolet / GM (manufacturer, dealer-service marketing page). The cause of pulsation and when rotors need work.
• 5 Warning Signs That Are Telling You To Get Your Brakes Checked. Toyota Canada (manufacturer; Canadian site). A second maker's signs, with a different explanation of pulsation.
• 49 CFR 571.116, Standard No. 116: Motor vehicle brake fluids. eCFR (regulation). The federal container warning that brake fluid absorbs moisture.

Road safety and the seasons

• Winter Weather Driving Tips. NHTSA (agency). A winter kit and vehicle prep.
• Car safety / Emergency Kit for the Car. Ready.gov, FEMA / DHS (agency). A federal car kit list and pre-emergency checks.
• Carbon Monoxide (CO) Poisoning Basics. Centers for Disease Control and Prevention (agency). Exhaust-leak and garage CO risk.
• Injuries Associated With Hazards Involving Motor Vehicle "Jack Failures" (Research Note). NHTSA National Center for Statistics and Analysis (agency). National injury estimate for jack failures.
• Vehicle Repair FACE Facts, New York. New York State Department of Health, NIOSH FACE program, via CDC Stacks (agency). Fatal case examples.
• Consumer Advisory: Warning to Harbor Freight Jack Stand Users. NHTSA (agency). Evidence that the safety equipment itself can fail.

Warning lights and onboard diagnostics

• 49 CFR 571.101, Standard No. 101: Controls and displays, Table 1. eCFR (regulation; table images from federalregister.gov, 90 FR, Jan. 3, 2025). The only federal telltale colors.
• Dashboard Warning Lights Explained. Toyota Motor North America (manufacturer). One maker's color convention and light meanings.
• What do the warning and indicator lights in my Ford mean? Ford Motor Company (manufacturer). Color guidance and the flashing check-engine meaning.
• Engine Check/Malfunction Indicator Warning Light (MIL), 2022 Ram 2500/3500 owner's manual. Stellantis / Mopar (manufacturer). Steady vs flashing MIL in one maker's words.
• Emissions Inspection and Maintenance Programs, 2022 Ram 2500/3500 owner's manual. Stellantis / Mopar (manufacturer). How the MIL relates to emissions inspection.
• What do Volkswagen dashboard lights mean? Volkswagen of America (manufacturer). A red/amber split and flashing = misfire.
• Warning Lights. Hyundai Motor America (manufacturer). What-to-do text per light.
• Learn about the Warning Lights and informational icons in your vehicle. Chevrolet / GM (manufacturer). Stop and tow guidance per light.
• Car Dashboard Lights Explained. Mazda North American Operations (manufacturer). Color variation and the role of a code reader.
• 40 CFR 86.1806-17, Onboard diagnostics. eCFR / EPA (regulation). What OBD must do by federal rule.
• Code Readers (Goss' Garage, episode 3542). MotorWeek, Maryland Public Television (trade press; practitioner Pat Goss). The code-vs-diagnosis distinction.

Sounds, smells and leaks

• Identify Car Leaks Like a Pro. AAA Club Alliance (membership org). Fluid identification by color, feel, smell and location.
• Smells and sounds that could mean car trouble. AAA Western and Central New York (membership org). Plain descriptions of sounds and smells.
• Your Nose Knows: Six vehicle warning signs you can smell (Car Care Council release, reprinted). AutoInc. magazine, Automotive Service Association (trade press), quoting the Car Care Council (aftermarket industry group, possible interest in more service). A smell list.

How estimates are built

• Mechanic Labor Guide: Usage Tips. MOTOR Information Systems (trade publisher/vendor). How book labor times are made and used.
• Average Mechanic Labor Rate: Repair Costs in Your State 2026. AAA Automotive (membership org). Labor-rate context and pricing methods.
• Industry Insights: U.S. Auto Repair Shops and Labor Rate Trends. Ratchet+Wrench, Griffin Matis (trade press). The most specific public labor-rate distribution.
• Proper Parts Pricing to Insure Profitability. ALLDATA, David Bry (trade publisher/vendor). Why shop parts prices exceed parts-store prices.
• Mark-Up vs. Margin: Knowing the Difference Makes a Difference in Profits. Tire Review, Gary Goms (trade press). Markup vs margin definitions.

Federal consumer rules

• Auto Repair Basics. Federal Trade Commission, Consumer Advice (agency). Choosing a shop, how labor is priced, written estimates, parts classes, repair orders, disputes.
• Auto Warranties and Auto Service Contracts. FTC Consumer Advice (agency). Warranty vs service contract, independent shops, aftermarket parts, records, scams.
• What to know about auto service contracts and extended warranty scams. FTC Consumer Alert, Colleen Tressler (agency). Service contract buying cautions, scam pattern.
• FTC says companies' warranty restrictions were illegal. FTC Consumer Alert, Seena Gressin (agency). Plain statement of the Magnuson-Moss tying rule, with enforcement examples.
• 15 U.S.C. 2302(c), Magnuson-Moss Warranty Act, prohibition on tying. Cornell LII (legal publisher reproducing the U.S. Code). The statutory anti-tying rule.
• 16 CFR 700.10, Prohibited tying. eCFR (agency, Office of the Federal Register). FTC interpretation with examples.
• 15 U.S.C. 2301, definitions (written warranty, service contract). Cornell LII. Legal definitions.
• Using Credit Cards and Disputing Charges. FTC Consumer Advice (agency). Fair Credit Billing Act dispute steps.
• 15 U.S.C. 1666i, Fair Credit Billing Act, claims and defenses against card issuers. Cornell LII. Statutory conditions for quality disputes.
• Watch Out for Auto Warranty Scams. Federal Communications Commission (agency). Robocall scam pattern and complaint routes.
• Where to file a complaint about your car; State consumer protection offices. USAGov (agency). Complaint routing.

State examples: California

• Maintenance and repairs. California Bureau of Automotive Repair (agency). Consumer rights list.
• Write It Right: Documentation and authorization requirements for automotive repair dealers. California BAR (agency). Detailed estimate, authorization, invoice and records rules with citations.
• California Business and Professions Code 9884.9. Public.Law mirror of leginfo (legal publisher). The statutory estimate rule.
• File a complaint. California BAR (agency). Complaint scope and process.
• Guide to Automobile Service Contracts, Extended Warranties and Other Repair Agreements. California Department of Insurance (agency). Types of repair agreements, licensing, cancellation.
• California's Lemon Law Q&A. California Department of Consumer Affairs, Arbitration Certification Program (agency). One state's lemon-law presumption, as a place to ask.

State examples: New York, Florida, Michigan, Massachusetts and Washington

• Know Your Rights in Auto Repair. New York State DMV (agency). Repair Shop Act consumer rights and complaint process.
• Florida Statutes 559.905, Written motor vehicle repair estimate and disclosure statement required. Florida Legislature (agency). Estimate threshold and contents.
• Florida Statutes 559.909, Notification of charges in excess of repair estimate. Florida Legislature (agency). Over-estimate tolerance and parts inspection.
• Florida Statutes 559.911, Invoice required. Florida Legislature (agency). Invoice contents.
• Motor Vehicle Repair (consumer rights). Florida Department of Agriculture and Consumer Services (agency). Plain-language Florida rights, getting the car back, complaints.
• MCL 257.1332, Motor Vehicle Service and Repair Act, written estimate. Michigan Legislature (agency). Estimate and over-estimate rule.
• MCL 257.1333, right to receive or inspect replaced parts. Michigan Legislature (agency). Michigan's default return of parts.
• MCL 257.1334, written statement on return of vehicle. Michigan Legislature (agency). Final statement contents.
• Repair facilities. Michigan Department of State (agency). The state's own reading of the Act.
• File a complaint. Michigan Department of State (agency). Complaint route.
• Massachusetts Consumer Guide: Mechanics of Auto Repair. Massachusetts Office of Consumer Affairs and Business Regulation, Division of Standards (agency). The AG's motor vehicle regulations (940 CMR 5.05) in plain language.
• Auto Repair. Washington State Office of the Attorney General (agency). Washington rights, liens, dispute options.
• RCW 46.71.015 and 46.71.025. Washington State Legislature (agency). Statutory text.

Choosing a shop and dispute programs

• Resources for Drivers. National Institute for Automotive Service Excellence (standards/certification body). What ASE certification means.
• Blue Seal of Excellence Program Overview. ASE (certification body). What the Blue Seal shop recognition requires.
• AAA Approved Auto Repair. AAA (membership org). Program terms for approved shops.
• Insist On A Written Repair Estimate. AAA (membership org). What an estimate should contain.
• How BBB AUTO LINE Works. BBB National Programs (nonprofit self-regulation body). Scope of the manufacturer dispute program.

Service records, costs and talking with a mechanic

• Your Driving Costs 2026 fact sheet. AAA (membership org). National average ownership and operating costs for new vehicles, including maintenance, repair and tires.
• Your Driving Costs 2026 brochure (per-category tables). AAA (membership org). Maintenance cents per mile by vehicle category.
• AAA: New Vehicle Ownership Costs Hit $12,863 Annually. AAA (membership org). Methodology notes for the 2026 edition.
• Your Driving Costs 2025 fact sheet (with brochure. Prior-year comparison only.
• Table 2. CPI-U, U.S. city average, by detailed expenditure category, 2026 M09 results. U.S. Bureau of Labor Statistics (agency). Year-over-year price change for car maintenance and repair.
• Auto Repair Basics. Federal Trade Commission (agency). Estimate, invoice, old parts and second-opinion advice.
• Buying a Used Car From a Dealer. Federal Trade Commission (agency). The Buyers Guide and limits of history reports.
• Dealer's Guide to the Used Car Rule. Federal Trade Commission (agency). Who the Rule covers and what the Buyers Guide says.
• Used Cars (feature page). Federal Trade Commission (agency). Where to get history reports and recall checks.
• Steering clear of vehicle history report scams. Federal Trade Commission (agency). A seller-side warning about history report sites.
• 2026 Warranty & Maintenance Guide (Tacoma). Toyota Motor North America (manufacturer). A manufacturer's own maintenance-records language.
• Owner's responsibility (2026 Tucson Plug-in Hybrid owner's manual, web). Hyundai Motor Company (manufacturer). A stricter records stance than Toyota's.
• Odometer Fraud. NHTSA (agency). Odometer fraud scale and detection tips.
• 49 CFR 580.17 Exemptions (Odometer Disclosure Requirements). eCFR, National Archives / NHTSA (agency, regulation). Exact odometer-disclosure exemptions.
• VehicleHistory (NMVTIS) home. U.S. DOJ, Bureau of Justice Assistance (agency). What NMVTIS is for.
• Understanding an NMVTIS Vehicle History Report. U.S. DOJ, BJA (agency). The five data points.
• Consumer Access Product Disclaimer. U.S. DOJ, BJA (agency). Limits of NMVTIS.
• Research Vehicle History (approved NMVTIS data providers). U.S. DOJ, BJA (agency). Who sells NMVTIS reports.
• A Consumer's Guide to Auto Repair. California Bureau of Automotive Repair (state agency). How to describe a problem, paperwork, old parts, guarantees.
• Most U.S. Drivers Leery of Auto Repair Shops. AAA (membership org). The trust survey headline.
• Auto Repair Survey fact sheet. AAA (membership org). Exact percentages and method.
• One-in-Three U.S. Drivers Cannot Pay for an Unexpected Car Repair Bill. AAA (membership org). A car-care fund recommendation.
• AAA Urges Drivers to Stay Proactive on Auto Repair and Maintenance. AAA (membership org). Breakdown call mix; check routine.
• Auto Dealership Service Staffers Should Act Like Lt. Columbo. WardsAuto (trade press). The three Cs of a repair order.
• How do I use the Digital Vehicle Inspection? Autoflow (software vendor). One vendor's color definitions.
• Digital Vehicle Inspection FAQ. Autoflow (software vendor). A different definition from the same vendor.
• Digital Vehicle Inspection Software: 7 Core Features to Look For. Tekmetric (software vendor). Another vendor's color scheme.
• Service Suite: Inspection. Solera (software vendor, dealer market). The commercial purpose of DVI color coding.
• Digital Vehicle Inspection Checklist: How to Create a Customer-Ready Report. ARI (software vendor). Example definitions and a caution against false urgency.
• Brake Inspection. Art's Automotive, Berkeley CA (practitioner). Why a red or yellow reading can differ from the manufacturer's limit; what to ask.
• Editor's Report (May 2013): wallet flushes. MOTOR magazine (trade press). Second-hand report of BAR's draft "Wallet Flushes" study.
• Is This Illegal? (flush services, part two). NBC Los Angeles (news investigation). A hidden-camera example of false "manufacturer recommends" claims.
• EZ Lube to Pay $5 Million in Penalties. Orange County District Attorney (government, prosecutor). An enforcement example on unnecessary services.
• Do you need a fuel service at the dealer? (Q&A). Consumer Reports (nonprofit testing org). A credible answer on an add-on fuel service.
• How to Decide If You Need a New Car. Consumer Reports (nonprofit testing org). Factors in a repair-or-replace decision.
• How to Make Your Car Last 200,000 Miles and More. Consumer Reports (nonprofit testing org). A car-fund amount and a cost timeline.

Recalls, complaints and service bulletins

• Check for Recalls: Vehicle, Car Seat, Tire, Equipment. NHTSA (agency). How the recall lookup works and owners' rights.
• 49 U.S.C. 30120, Remedies for defects and noncompliance. Legal Information Institute, Cornell (law text, publisher of record US Code). The legal basis for free repair and its limits.
• 49 CFR 577.7, Time and manner of notification. eCFR (regulation). The notice timing rule.
• Takata Air Bag Recall Spotlight. NHTSA (agency). The largest air bag recall and do-not-drive warnings.
• Report a Vehicle Safety Problem. NHTSA (agency). How to file a safety complaint.
• How to Get a Free Technical Service Bulletin. Consumer Reports (nonprofit consumer org; trade press). What TSBs are and how to find them.

Warranties: emissions, factory and secret warranties

• Emissions Warranties for 1995 and Newer Cars and Trucks: Questions and Answers (EPA-420-F-09-048). U.S. EPA, Office of Transportation and Air Quality (agency). How the federal emissions warranties work for owners.
• 40 CFR 85.2103, Emission warranty. eCFR (agency). Current regulatory warranty periods.
• 42 U.S.C. 7541(i), Clean Air Act warranty period. Cornell LII. Statutory warranty periods.
• California Vehicle and Emissions Warranty Periods (fact sheet). California Air Resources Board (agency). California emissions warranty terms beside the federal ones.
• Toyota Warranty and Owner's Manuals. Toyota Motor North America (manufacturer). An example of basic vs powertrain coverage.
• America's Best Warranty. Hyundai Motor America (manufacturer). An example of transfer limits on powertrain coverage.
• Manufacturer Communications. NHTSA (agency). Why warranty extensions are findable at NHTSA.
• California Civil Code 1795.92 (motor vehicle warranty adjustment programs). Public.Law mirror of leginfo.legislature.ca.gov (legal publisher; text verified against source Oct. 26, 2026 per the page). California's "secret warranty" law.
• warranty adjustment program. Cornell LII Wex (legal reference). Definition and state list.