read about breaking in new diesel engine - author repeatedly referred to warming up engine first. how do i know when i hit that sweet spot of proper warmed up-ness? i obsessively want to make sure i get it right and really know, not assume.
I would also wait until the oil temperature is warm. Five minutes after the water temp is in the middle I would consider the car as warm as it's going to get. The oil can take a little bit longer than the coolant.
i just didn't know where on the gauge was considered optimum...so when i take off in the morning, take it easy until when? in the old days, warm up meant idle and i know that is not good. not blonde, just honestly ignorant. a little embarrassed about it, too.
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