Center of the Universe, Huron County, Ontario. Can | When we came out with the DD-15 in 2007
We did some side by side tests vs same spec Series 60
DD-15 beat it by 5% same day same load etc etc, fuel SAE test .
BUT
That gap narrowed to less than 1% in winter.
Threw us for a loop.
Turns out.
The last few years of 60s have T stat in oil cooler.
The DD15 did not.
Oil was being overcooled !!!
DD-15s all have thermostats in the cooler now.
Cold oil relatively speaking takes hp to pump.
I'd leave em in.
My 2 cents
By the way, you want oil to get above boiling temp to boil off water, or you get acid forming.
Oil can be too cold.
Edited by Corn Field Cadilac 2/11/2015 20:39
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Oil temperature ISX.
