120k Mile Maintenance Checklist
A comprehensive 120,000-mile maintenance guide to ensure high-mileage vehicle reliability, covering critical fluids, timing components, suspension, and long-term wear items.
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| Item | Priority | Who | Time | What to check (Pass/Fail) | If failed (Next step) |
|---|---|---|---|---|---|
| Engine Oil & Filter | Required | Shop/DIY | 30 min | Clean oil at correct level | Change oil and filter |
| Engine Coolant Flush | Required | Shop/DIY | 60 min | Correct pH/color; no debris | Flush and refill system |
| Transmission Fluid | Required | Shop | 60 min | No burnt smell; correct level | Drain and fill or flush |
| Spark Plug Replacement | Required | Shop/DIY | 45-90 min | No heavy carbon or electrode wear | Replace all plugs |
| Timing Belt (if equipped) | Required | Shop | 4-6 hrs | No cracks, fraying, or oil soak | Replace belt and water pump |
| Serpentine/Drive Belts | Required | DIY | 20 min | No glazing or deep cracks | Replace belt |
| Brake Fluid Condition | Required | Shop/DIY | 45 min | Clear/amber; low moisture % | Flush brake system |
| Brake Pads & Rotors | Required | Shop/DIY | 45 min | >3mm pad thickness; no warping | Replace pads/resurface rotors |
| Tire Tread & Pressure | Required | DIY | 15 min | >4/32" tread; even wear | Rotate or replace tires |
| Suspension Bushings | Recommended | Shop | 30 min | No tearing or missing rubber | Replace control arms/bushings |
| Shock Absorbers/Struts | Recommended | Shop | 20 min | No visible oil leaks; no bouncing | Replace in pairs |
| Battery Health Test | Required | DIY | 10 min | 12.6V+; no terminal corrosion | Clean terminals or replace |
| Engine Air Filter | Required | DIY | 5 min | Filter is white/grey; no debris | Replace filter |
| Cabin Air Filter | Recommended | DIY | 10 min | No mold smell; clean pleats | Replace filter |
| Differential/Transfer Case | Recommended | Shop | 45 min | Fluid level full; no leaks | Change gear oil |
| Fuel Filter (External) | Optional | Shop/DIY | 30 min | No restriction in fuel flow | Replace filter |
| PCV Valve | Recommended | DIY | 15 min | Valve rattles when shaken | Replace valve |
| Wheel Bearings | Recommended | Shop | 20 min | No humming or play in wheel | Replace hub assembly |
| Exhaust System | Recommended | DIY | 15 min | No holes, rust, or loose hangers | Patch or replace sections |
| Wiper Blades | Required | DIY | 5 min | No streaking or torn rubber | Replace blades |
Use this table to track your progress. We recommend performing the 'Required' items first to ensure the vehicle is safe and mechanically sound. Items marked as 'Shop' often require specialized equipment like a lift or pressurized fluid exchangers.
Keep a physical copy of this checklist in your glovebox once completed. Documenting the date and mileage of these services significantly increases the resale value of your vehicle and helps you track long-term wear patterns.