Join Date: Feb 2010
Location: Narragansett Bay
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Re: Marvels Mystery Oil
A diesel guy that I know said MMO is not a good idea for diesels. He does, however, suggest Cetane booster, especially for larger diesel engines. Of course, if you buy these, you'll notice that some say you can use up to twice the dose and he says that's just marketing to keep the price reasonable. You need twice the dose to really make a difference. Biocide is the other must add for diesel fuel, but not attributed to the same guy.
Perhaps the best thing you can do is to just change the oil more regularly than required. Both time and hours degrade oil performance. You don't necessarily have to change the filter more regularly. If you just suck out the oil and pour in new, it's about a 15 min job.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.