Posted by jdemaris on April 18, 2010 at 11:31:23 from (67.142.130.24):
In Reply to: motor oil posted by esfarmer on April 18, 2010 at 05:01:19:
Many tractor and diesel engine companies did not want multi-viscosity oils being used in diesels - like 15W-40. The main reason was the polymers used in petro-based multi-oils tend to gum up piston rings. Straight-grade oils don't have those polymers. This was more of problem in diesel pistons with square-rings, and not the triangular Keystone rings.
Newer multi oils seem to be less of a problem. And, synthetic non-petro mulit-oils NEVER had the problem since they don't use polymers like organic multi-oils do.
Many diesel engine companies still give a preference for straight-grade oils. Especially for Detroit two-stroke-cycle diesels.
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