Not sure who Ken Chachi is.

I do know, most big HP MARINE engine builders, wouldn't care for oil temps continuously at 250*. One of the biggest builders, Mercury Marine, and Mercury racing, do not set their engines up to run those kind of oil temps.

In automotive, oil temperatures normally remain consistent with coolant temp. Also why some vehicles have engine oil coolers built into the radiator, and still have a external cooler in front of radiator to keep things cool. Mainly you see that in trucks, setup for towing.

OMG you Dont know who ken chachi is??

Am I supposed to ?

No comprendo here as well, who is ken chachi?

BTW, that chart is exactly right. You should run 180f cruise and let the temp rise for a wot blast. This idea of running above 212f on the gage to eliminate condensation is falicy. The oil cycling gets much hotter than the gage will ever read.

I never used to have oil stats. At wot, maybe i'd see 140* at most. Never had condensation issues, and when engines tore down after 6-7 seasons, bearings looked great.

I did however install the Merc HP500 style oil stats and plate style coolers when rebuilding last year. Couldn't be happier with the setup. My temp gauges will sit at 180* all day long cruising, and have had it WFO for 6-7 miles straight at 5600-5800RPM, sits at 210 and no hotter.

The problem ended up to be faulty gauges. I installed 2 new gauges and my temperatures on both engines are running about 180, 190 at cruise and go up to 215, at wot blast.