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 - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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