Chuckconnie

Onan Oil

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FIVE   

I'd have to run a lot more miles at slightly better MPG than I do to make up the difference in cost between synthetic vs 15w40  Rotella.

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wolfe10   

Wow!

Remember oil changes per engine manufacturers specs are based on BOTH miles and TIME (annual).

Also, when was the last time you heard (twitter doesn't count) of a HD diesel failure due to oil-related issue???

I absolutely use synthetic oil in my gasoline powered vehicles.  But, not in my HD diesels (either Caterpillar or Cummins).

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jleamont   

Yeah, the Detroit DD13 has a 35,000 mile service interval.

Five, not a synthetic oil change but a lighter weight would also help. Discuss with your local Freightliner dealer, just might benefit you.

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