Quote:
Originally Posted by RSH
I've never liked that on any car, it's counter to physics and what I have practiced for forty tears. I avoid even medium rpm's and minimize load (soft foot) until the oil (in my cars that have it) or water temp has at least moved off the peg, usually longer. I want es much expansion as possible before stressing the engine. I assume the manufacturers believe it is not harmful but that does not mean it's good.
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1500rpm with no load isn't stressing your engine. The increased idle at cold start up is because a cold engine won't idle worth a damn at a lower rpm. I would guess idling at 650 cold would cause carbon deposits more detrimental than a small bump in engine speed.