Quote:
Originally Posted by StraightOuttaCanadaEh
at 4000 rpm your engine is spinning faster than at 2000 rpm, hence the extra wear from going faster vs going slower. More heat, more friction, more wear, no? That'd be my guess
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Nope. Although that would seem logical it doesn't work that way. As revs increase so does lubrication and cooling. Your engine makes up for the change and for all intents and purposes it still is at the same levels as long as you are within the engineered operating range. Yes some things will "wear" faster through the extra fuel flow required but this difference would be very small. Yes if you are driving for a long period at red line or are rapidly changing revs you are adding wear since it is outside of the designed specs for cruising.
If anything cruising at too low of revs (there was somebody here that swore cruising at 1,000 whenever possible was best) can be harder on an engine than 4,000 since it would lug and lose oil pressure every time you tried to accelerate.