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Old 02-21-2016, 07:18 AM   #16
caltexflanc
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City: North Carolina for now
Join Date: Aug 2011
Posts: 6,348
Do what the engine and transmission manufacturers say you should do, for your exact engine in marine use. Over thinking it or relying on urban legend or what some anonymous guy on the internet says he got away with... why?

I agree with frequent oil analysis on engines and transmissions; I did mine every engine oil change as it was easy. (Did transmissions then too, though they had a longer change period) Over time, it will tell you if you can cheat on the long side a little if it will be inconvenient to do right on schedule. Plus if you ever go to sell the boat, it is yet another sign of a conscientious boat owner to buyers and their surveyors.
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"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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