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This would cause serious engine damage, as the engine speed ( rpm) would be too high, and the engine would overheat badly. The engine parts would be seriously overheated and the engine bearings and seals would probably begin to leak oil from over pressure.

-it would probably burn out your rear seal and blow oil everywhere but other then that it shouldn't be to bad, maybe

Actually, the worst that happened is you used too much fuel. Engine overheating doesn't occur in any particular gear unless there's a problem to begin with. High RPM's for short periods aren't harmful. After all, you increase your engine speed when your car goes into passing gear, there's no harm done to your auto.

It could also overheat your transmission if it is an automatic trans. NOT good. If it is a 3-speed automatic, being in 2nd gear would not be as bad as if it were a 4-speed automatic though. Because then the RPM's would be higher than on a 3-speed, creating even MORE heat.

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Q: What would driving in second gear at highway speeds for ten minutes do to a car?
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