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ROTELLA T4, T5 or T6

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If costs didn’t matter, which one would you suggest?


2004 Wakesetter 21’ with 310/350 Indmar (still not sure which one is my engine as I can’t find a place to match the S/N or Model to Engine type)


all oils are 15W-40


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I would get the one that has an S rating (e.g. SN) for spark (gasoline) engines to go along with the C rating for compression (diesel) engines.

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$23 a gallon T6. Is what I used until they dropped the S rating.  Likely still fine.  I use Delo SDE now, about same price and still has a S rating.

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