The MS oil spec was introduced in 1953 and was the highest grade oil available at that time. It is more or less equivalent to spec SC. Both those specs are now obsolete. Spec S with any letter beyond C would be superior to MS.
Whether to use a non-detergent oil or not has usually depended on the history of the engine, if it has been previously run extensively with a non-detergent oil. No non-detergent oil would meet spec MS.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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