A few years ago that was true. Diesel oil had a very high ash level (in IH oil it was over 3X higher than their low ash "gas engine" oil). With the goverment mandated Ultra-low-sulfur diesel and the current crop of diesel oils to maatch the ash level is as low (lower?) as it is with "gas engine" oil.
Using "diesel oil" in a gas tractor in 2005 and before was hard on those old engines - especially the ones worked hard.
That being said most quality gas motor oils are low ash (and have been for years) - some are just lower than others. I know Castrol GTX 10w-30 has a lower ash content than IH's "low ash oil".
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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