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Old 04-01-2018, 10:24 AM   #2
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
Depends on the engine and the loading. Some 3208TA in high output apps you can change the oil three times in a row and it is black after a couple hours run. Run same engine at 1200 and it will stay clean for 20hrs.

Nothing wrong with black oil, it's just soot.

On my 450C, it is pretty black at 50-100hrs, I change it at about 300hrs.

If it bothers you, take a sample and see what the soot/insolubles are.
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