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it loses 4 horse power per year or 50 per 20 000 miles
That is not quite true, it is more of a percentage than an actual #. For example, my son has a 2000 Chevy Camaro V6 rated at 200HP with about 100K miles. Using the above answer of 50HP loss per 20K miles, his car would now be at zero. After some recent performance modifications, a dyno test yeilded a surprising 174 HP (at the wheel). And FYI there is a difference between engine HP and wheel HP, actual wheel HP is about 10 - 15% less than engine HP.
Most experts (Car and Driver, Carcraft, Hotrod, Edmunds....) will agree an engine normally driven will need the first 20K miles just to break in. Most well maintained cars will not start to loose significant amounts of HP until well after 100K - 150K. (not withstanding poor design).
Take care of your car and it will take care of you. Do your scheduled maintenance and your car will live a long life. Don't take care of it, drive it like a hot rod (even if it is one) and it won't.
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∙ 12y ago
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