At 80,000 Miles
- Spark plugs — if original, they’re overdue. Replace with iridium for another 60K miles.
- Battery — test it. Most original batteries are reaching end of life at this point.
- Engine oil — consider shorter change intervals (every 8K miles instead of 12K).
At 100,000 Miles
- All of the above, plus:
- Glow plugs (diesel) — due for replacement at 100K.
- Consider premium oil — higher-quality fully synthetic oil provides better protection as engine tolerances open up.
At 150,000+ Miles
- All of the above, plus:
- Shorter oil change intervals — every 5-8K miles to keep a clean engine.
- Monitor oil consumption — some oil burning is normal at high mileage. Top up between changes.
- Replace all bulbs proactively — heat cycling from 150K miles of use weakens filaments.
Frequently Asked Questions
Is it worth maintaining a high mileage car?
Absolutely. Modern cars regularly exceed 200K miles with proper maintenance. The consumables cost is a fraction of car payments on a replacement vehicle.
Should I use thicker oil in a high mileage engine?
Only if the manufacturer allows it. Some high-mileage oils exist (Castrol GTX High Mileage, etc.) that add seal conditioners, which can be beneficial. But don’t change the grade without checking.
