Originally Posted By: moribundman
Originally Posted By: CharlieJ
Do engines lose power overtime as the miles accumulate? I would imagine that power loss and maintenance would have a positive correlation. Is there a rule of thumb for engines losing power at say 50K, 100K or 150K miles?
My car's engine was still loosening up noticeably at 50k miles. At over 180 k miles the engine revs more freely and offers better acceleration than ever. I can't comment on achievable top speed and a possible change over time, since the top speed is governed. Unless compression suffers due to excessive wear, and presuming all other relevant components (inteake, exhaust, ignition, etc) are in fine shape, I don't think an engine will lose power with age.
Exactly! Not until the engine is on the steep downward wear slope will you see a decrease. I think it makes the same or more power until it's on that downward slope which probably won't occur before 300,000 for modern cars.
100,000 miles is nothing as far as power loss from engine wear.