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interesting link
I've found that idling for as little as 30 seconds usually gets me down to reasonable temps.
I'd guess that $300 of fuel is an awful lot of 30 second idle shutdowns
and...
it isn't just oil that's involved here. Running the motor allows the head itself to get cooled, and the exhaust manifold.
To some extent I suspect that you've got to balance out the fuel wastage with the the long-term engine care.
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