Excess fuel especially when the motor is cold is a top notch way to shorten the life of your motors rings and cylinder walls and cut into the lubricating ability of your oil!
Also it’s been proven long ago that any motor will experience the least amount of ware when it warms up fast by being driven, not just sitting and idling for 5 minutes or more.
This is not to say you should should warm it up by driving like a mad man, just a nice 30 mph at 1800 rpm is perfect.
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I do stuff for reasons.
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