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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