I am plumbing 2 new oil coolers for my boat. My engine builder marked the oil thermostat block for oil to cooler and from cooler. Hooking to the cooler, does the oil flow the same direction as the water, or against it?
Thanks
Mark

flow the oil against the water direction

in reality,it just does not matter,might be a few deg differance.

Thanks guys, only 4 more lines to hook up and she is ready to fire and splash.