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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
... [Read Article]
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