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Originally Posted by GEN XER
Gentlemen what is EOS?
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General Motors Engine Oil Supplement - or E.O.S. for short. The gm part is ENGOILSUP. It's available at gmpartsdirect or at some GM dealers. It's an old school product, but is beginning to find a new generatio nof fans. Basically, it adds the zinc and phosphorous (engine wear fighting compounds) what have been eliminated from the new "SM" formulations of oil, which used to be in the "SL" formulations. It comes in a one pint bottle, and should nicely bring any current oil up to levels seen several years ago.