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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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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