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Old 11-15-2018, 05:34 AM   #8
Ski in NC
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City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
Completely normal. A run up to high power setting will increase oil temp by quite a bit, and thus reduce viscosity.

I kind of doubt oil temp only went up from 170F to 180F. Usually at high power oil temp is more like 190-200F, but that depends on how long at power and where you are measuring the temp. I don't think the QSB from the factory has an oil temp sensor, so probably some sort of aftermarket device.

I've sea trialed many of these and the posted numbers are typical.
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