Ash was included in IH oil to counteract the results of the sulfur in the fuel. The sulfur left behind after combustion would mix with water in the oil and become sulfuric acid. This acid would attack the bearings.
Because of the high ash content of their diesel oil IH went to a 200 hour oil change interval when using IH No. 1 oil. The oil change interval was kept at 100 hours for other oil.
With the advent of low sulfur diesel fuel the need for ash in the oil has decreased. The sulfur was removed for pollution control reasons.
The IH Low Ash oil had an ash content of .5%. IH No. 1 Oil was about 2% ash.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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