The schedule that prevents every expensive repair you've heard horror stories about.
The Owner's Manual
The single most useful object in your car, and the one most people never open. It tells you exactly which fluids your car wants, in what amounts, and how often. Generic advice on the internet is a starting point. The manual is the answer.
| Section | What You'll Find |
|---|
| Maintenance schedule | When to service what |
| Fluid specifications | Exact types to use |
| Tire pressure | Correct PSI for your car |
| Warning lights | What each light means |
| Capacities | How much oil, coolant, etc. |
When the manual disagrees with a forum post, the manual wins.
Maintenance Schedule Overview
Based on Time or Mileage (Whichever Comes First)
| Interval | Key Services |
|---|
| Every oil change | Oil + filter, multi-point inspection |
| 15,000-30,000 miles | Air filters, brake inspection |
| 30,000-60,000 miles | Transmission, coolant, spark plugs |
| 60,000-100,000 miles | Timing belt, major services |
| 100,000+ miles | Continued maintenance, more frequent checks |
Oil Changes
The single most valuable habit you have as an owner. Skip oil changes and you will eventually buy a new engine.
Why Oil Matters
| Function | How |
|---|
| Lubrication | Reduces friction between moving parts |
| Cooling | Carries heat away from engine |
| Cleaning | Suspends contaminants |
| Protection | Prevents corrosion |
Oil Change Intervals
| Condition | Interval |
|---|
| Normal driving, synthetic oil | 7,500-10,000 miles |
| Normal driving, conventional | 3,000-5,000 miles |
| Severe conditions | Check manual, often 50% of normal |
Severe Driving Conditions
- Frequent short trips (under 5 miles)
- Stop-and-go traffic
- Extreme hot or cold
- Dusty conditions
- Towing or heavy loads
- Mountainous terrain
Oil Types
| Type | Characteristics | Best For |
|---|
| Conventional | Basic mineral oil | Older cars, simple use |
| Synthetic blend | Mix of conventional/synthetic | Moderate improvement |
| Full synthetic | Engineered molecules | Best protection, most cars |
| High mileage | Added conditioners | 75,000+ mile engines |
Oil Weight
Common ratings: 0W-20, 5W-30, 10W-30
| Part | Meaning |
|---|
| First number (0W, 5W) | Cold viscosity (W = Winter) |
| Second number (20, 30) | Hot viscosity |
Use the weight your owner's manual specifies. Modern engines have tight tolerances; the wrong viscosity does real damage over time.
Tire Care
Tire Pressure
| Why It Matters | Effect |
|---|
| Underinflated | Poor fuel economy, edge wear, blowout risk |
| Overinflated | Harsh ride, center wear, less traction |
| Correct | Best fuel economy, even wear, optimal handling |
Check pressure monthly and before any long trip. Always check when tires are cold; driving heats the air inside and gives you a false high reading.
| Where to Find Correct Pressure |
|---|
| Driver's door jamb sticker |
| Owner's manual |
| NOT the tire sidewall (that's max pressure) |
Tire Rotation
| Pattern | When |
|---|
| Every 5,000-7,500 miles | With oil change is convenient |
| Rotation Pattern | For |
|---|
| Front to back (same side) | Directional tires |
| X-pattern | Non-directional |
| Rearward cross | RWD vehicles |
| Forward cross | FWD vehicles |
Tire Wear Indicators
| Wear Pattern | Cause |
|---|
| Center wear | Overinflation |
| Edge wear | Underinflation |
| One-sided wear | Alignment issue |
| Cupping/scalloping | Suspension issue |
| Feathering | Alignment or suspension |
Tread Depth
The penny test: insert a penny head-first into the tread. If you can see all of Lincoln's head, the tires are at or below 2/32" and need replacing.
| Depth | Condition |
|---|
| 10/32" | New tire |
| 4/32" | Consider replacement |
| 2/32" | Legal minimum, replace immediately |
Tire Age
Tires degrade with age regardless of tread.
| Tire Age | Action |
|---|
| 6 years | Inspect carefully |
| 10 years | Replace regardless of condition |
Find manufacture date: DOT code on sidewall, last 4 digits = week/year
Fluid Checks
Engine Oil
| Step | How To |
|---|
| Park on level ground | Ensure accurate reading |
| Wait after running | 5-10 minutes |
| Remove dipstick | Wipe clean |
| Reinsert fully | Pull out again |
| Read level | Should be between marks |
| Check color | Golden/amber good, black needs change |
Coolant
| Step | How To |
|---|
| Engine cold only | Hot coolant pressurized |
| Check reservoir | Level between min/max marks |
| Check radiator (if accessible) | Full when cold |
| Check color | Should be clean, not rusty |
Never open a radiator cap when the engine is hot. The system is pressurized and will spray boiling coolant.
Brake Fluid
| Step | How To |
|---|
| Locate reservoir | Usually on driver's side near firewall |
| Check level | Between min/max marks |
| Check color | Clear to light yellow (dark = change) |
| Don't overfill | Pads wear down, level rises |
Transmission Fluid
| Step | How To |
|---|
| Check manual | Some have no dipstick |
| Engine running | Warmed up |
| Shift through gears | Return to park |
| Check dipstick | Level and condition |
| Color | Red/pink good, brown/burnt = problem |
Power Steering Fluid
| Step | How To |
|---|
| Locate reservoir | Usually near engine belts |
| Check level | Hot and cold marks often shown |
| Check condition | Clear, not foamy |
Windshield Washer
| Step | How To |
|---|
| Open reservoir | Usually clearly marked |
| Fill with washer fluid | Not water (freezes, no cleaning power) |
| Don't overfill | Leave room for expansion |
Filter Replacements
Engine Air Filter
| Interval | Notes |
|---|
| 15,000-30,000 miles | Or as dirty |
| Check every oil change | Visual inspection |
Symptoms of dirty filter:
- Reduced fuel economy
- Reduced power
- Rough idle
Cabin Air Filter
| Interval | Notes |
|---|
| 15,000-25,000 miles | More often in dusty/polluted areas |
| Often forgotten | But easy to replace |
Symptoms of dirty filter:
- Reduced airflow from vents
- Musty smell
- Poor A/C performance
Fuel Filter
| Interval | Notes |
|---|
| 20,000-60,000 miles | Check manual |
| Many modern cars | Integrated in fuel tank |
Brake Maintenance
Inspection Schedule
| Interval | What to Check |
|---|
| Every oil change | Visual check if visible |
| Every 12,000 miles | Thorough inspection |
| When symptoms appear | Immediately |
Brake Pad Life
| Driving Style | Expected Life |
|---|
| Highway driving | 40,000-70,000 miles |
| City driving | 25,000-40,000 miles |
| Aggressive driving | 15,000-25,000 miles |
When to Replace
| Sign | Action |
|---|
| Wear indicator squealing | Replace soon |
| Grinding noise | Replace immediately |
| Pad thickness < 3mm | Replace |
| Uneven wear | Replace and investigate |
Brake Fluid Replacement
| Interval | Why |
|---|
| Every 2-3 years | Absorbs moisture, reduces boiling point |
| When dark | Has absorbed moisture/contaminated |
Transmission Care
Automatic Transmission Fluid
| Interval | Notes |
|---|
| 30,000-60,000 miles | Severe conditions |
| 60,000-100,000 miles | Normal conditions |
| Check manual | Varies significantly by vehicle |
CVT Fluid
| Interval | Notes |
|---|
| 30,000-60,000 miles | CVTs are more sensitive |
| Use correct fluid | CVT-specific required |
Manual Transmission
| Interval | Notes |
|---|
| 30,000-60,000 miles | Often overlooked |
| Check for leaks | Common at seals |
Cooling System
Coolant Change
| Interval | Type |
|---|
| 30,000 miles / 2 years | Conventional (green) |
| 100,000+ miles / 5 years | Extended life (orange, red) |
Hose Inspection
| Check For | When |
|---|
| Cracks, bulges, soft spots | Every oil change |
| Leaks at connections | Regularly |
| Squeeze test | Should feel firm, not mushy |
Battery Maintenance
Battery Check
| Test | What to Check |
|---|
| Visual | Corrosion, cracks, bulging |
| Terminals | Clean, tight connections |
| Voltage test | 12.4-12.7V when off |
| Load test | Annual, at shop |
Extending Battery Life
| Practice | Benefit |
|---|
| Keep terminals clean | Better connection |
| Avoid short trips | Allows full charging |
| Turn off accessories | When starting |
| Park in shade/garage | Extreme temps reduce life |
Wiper Blade Replacement
| Interval | Notes |
|---|
| 6-12 months | Or when performance decreases |
| When streaking | Time to replace |
| When chattering | Time to replace |
Creating a Maintenance Log
What to Record
| Information | Why |
|---|
| Date | Track intervals |
| Mileage | Calculate intervals |
| Service performed | Know what's been done |
| Cost | Budget for future |
| Who performed | Warranty, quality |
| Parts used | Compatibility |
| Method | Notes |
|---|
| Paper log in glove box | Simple, always available |
| Spreadsheet | Detailed, calculable |
| App (Drivvo, Fuelly) | Reminders, analytics |
| Service records | Keep all receipts |
Key Takeaways
- The owner's manual is the source of truth for your specific car
- Oil changes are non-negotiable; skipping them is the most expensive mistake an owner makes
- Tire pressure affects safety, wear, and fuel economy; check monthly when cold
- Fluid checks catch problems before they become repairs
- Squeaks, leaks, and warning lights are the car asking for attention
- Keep records; they help at resale and tell the next mechanic what's been done
- Severe driving (short trips, heat, dust, towing) cuts intervals roughly in half
Next Steps
Continue to 03-diagnostics.md to learn how to read what the car is telling you through lights, sounds, and smells.