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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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