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Look at the certifications on the bottle. I've been using the Rotella or Delo for years.

From older threads on this topic:
. . .
From the owners manual.

Indmar recommends 15W-40 Pennzoil...

Maxpower made a great point a while back in this same discussion. When was the last time you ever heard of anyone have an engine problem or failure due to the breakdown of the oil? You could...