I think when you rebuild the engine and chassi you get all the preformance back no mather how far you've driven..
You basicly turn the state of the car back to brand new..![]()
What I'm asking is, whether it's enough to rebuild it after 20,000 miles, or should I do it earlier?
Rebuilding the engine and chassis is basicly giving you a brand new car, as if you had done 0 miles. 20000 miles is a long way to go without doing this, but if the car still works good then you dont need it. But for sure, after 20000 miles it will gain quite some performance from a rebuild.