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Old 11-05-2020, 02:55 AM   #16
High Wire
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City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,964
Quote:
Originally Posted by j11av View Post
Thanks for the info. What temps are cold and warm for you? I'd imagine big difference between NJ and FL. Seemed like current oil used is straight 30, I'd think of switching to 15W40 and see if any much difference.
Cold for me is a typical Florida morning startup of about 40-70 degrees F outside air temp. After running under load for at least 10 minutes my engine stabilizes around 180F coolant temp. Idling in a lock could last 30 minutes. Coolant temp will typically drop to 160F.

Hot is when running over 2000 RPM will reach about 200F coolant temp. I never run here more than a minute or two just to make sure I can get to WOT.

I use 10W30 Rotella because my generator recommends it and is on the list of approved oils for my Perkins. Its convenient to only need to carry one or two jugs of the same spare oil plus its readily available anywhere. 15W40 is an option.

I would not use straight SAE 30 without an oil pan heater or engine room ALWAYS above 70F. That's my choice.
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Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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