Thread: Rotella ?????
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Old 05-29-2007, 08:41 PM
DocB DocB is offline
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Join Date: Nov 2006
Location: New Jersey/Pennsylvania
Posts: 224
5W-40 vs. 15W-40
For all you guys out there running Amsoil in the summer in a 7.3L PSD:

Why run the 5W-40 instead of the 15W-40 HD Diesel and Marine Oil?

I'm interested in what you all have to say about this.
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