2002 tiffin zephyr Cummins ISL?

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Not sure but there is lots of ZDDP and Ca in my oil! That Mongolian diesel has lots of sulfur.
 
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I don't think you have an ISL. Cummins ISL is a 9 liter diesel, I think you have a 500 HP ISM.
 
Originally Posted by Koop
I don't think you have an ISL. Cummins ISL is a 9 liter diesel, I think you have a 500 HP ISM.


There used to be a 10-liter L-series Cummins engine. It peaked at 400 HP rating around 1991, then was stroked to become the 11-liter M. That thing has been boosted to 600 HP in pleasure marine applications...
Then the 8.3L C-series was stroked to become the 8.9L L-series.

Yeah, I'm sort of a Cummins nerd.
 
Originally Posted by Koop
I don't think you have an ISL. Cummins ISL is a 9 liter diesel, I think you have a 500 HP ISM.

I know...... thanks
I noticed it too late in the timespan allowed to edit
 
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