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Gee, it seems that this discussion is turning back to the "I read it on the Internet so it must be true" rather than listening to the people who actually have seen the hardware!
Engine designers try purposefully to raise the engine temperature AND oil temperature as fast as possible to try and bring everything to equilibrium. All to reduce wear and friction.
If we want to bring the environment into it, with a closed loop control system like most modern cars have the A/F ratio is controlled very tightly. If you were to calculate the total emissions you would find them lower at idle and low speed due to the much reduced air flow through the engine!
So.....warm it up and take it easy by whatever method suits you. It will only help, not hurt. IMHO
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