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Old 04-03-2016, 09:24 AM   #11
Nomad Willy
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City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
I change when hot. That is .. run for several hours not just run a bit at the marina. The additives, carbon and "dirt" (foreign matter) is much more in suspension when the engine is hot. And draining quickly before much "stuff" settles where it will remain in the engine is a goal for me.

My Mitsubishi Owners Manual says "Immediately after shutting down the engine (when the oil is hot) remove the oil pan drain plug." Changing when cold or warm is not mentioned.

I think many or most likely most manuals will say do it hot. Cars, motorcycles ect. Probably hard to change your lower unit OB oil hot though. But if you really need or want to change oil cold I don't know to what degree you've really done what needs to be done. The biggest reason to change oil is to remove the carbon and acids that form from moisture over time. But carbon (the black stuff) is an abrasive that wears engine parts like bearings and that's job #1 as far as I know.

So definitely change hot.
And IMO cold thick oil being a PITA has nothing to do w it.
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