There is ash and there is ash. IH oil low ash oil virtually eliminated the calcium, barium and magnesium from their so called low ash oil. Another oil may be lower in total ash but not necessarily those three components which are the ones that leave hard, insulating deposits behind on valve heads, spark plugs, pistons etc. I scraped and chiseled a lot of carbon from those valve burners for many years and low ash oil, along with good valve guide seals and better piston rings really made a difference. A valve face covered with a layer of hard ash cannot cool properly so it overheats, sticks in the guide, torch's out etc. The spark plugs on those engines would build up that hard carbon and bridge the gaps under heavy loads. Now days, very few see heavy work and the plugs get built up with soft carbons from puttering around. I do not know what low ash oils on todays shelves actually contain or do not contain.
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Today's Featured Article - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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