Posted by sotxbill on October 01, 2023 at 07:03:39 from (172.59.232.71):
In Reply to: Shell Rotella? posted by Geo-TH,In on October 01, 2023 at 03:54:01:
In a comparison on diesel oil vs a well know gas oil, the TBN on the gas oil was only 7.7 where the diesel oil was 12.7. That was one of several differences. While both have a very good base oil, its the additives packages. Diesel oil must also have anti clumping compounds to keep the soot suspended. Gasoline oil does not. Diesel engine oils have a higher anti-wear (AW) load in the form of zinc dialkyldithiophosphate (ZDDP). The catalytic converters in diesel systems are designed to be able to deal with this problem, while the gasoline systems are not. This is one of the main reasons you dont want to use a diesel engine oil in your gasoline engine. If your automobile was built prior to 1975, there is a good chance it does not have a catalytic converter, and thus the above statements do not apply. Diesel engine oil has more additives per volume. The most prevalent are overbase detergent additives. This additive has several jobs, but the main ones are to neutralize acids and clean. Diesel engines create a great deal more soot and combustion byproducts. Through blow-by, these find their way into the crankcase, forcing the oil to deal with them.
Some say that HD Diesel oils should not be used in gasolene high rpm, modern emission engines due to the higher additives. However these hd oils are very good for slow rpm gas engines like our old tractors. They also allow the tractors to go much longer between oil changes as the high base number continues to fight and neutralize acids due to sulphur and moisture contamination that gas oils can not handle.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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