The Slippery Truth About Motor Oil
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Available from GM dealers for about $10 per bottle, Engine Oil Supple-ment (E.O.S.) carries PN 1052367 and is a highly concentra-ted mixture of several key oil additives. It is designed to protect against piston scuffing and camshaft wear during the break-in period. But because of its heavy zinc and phosphorus content--which is advertised at no more than 5 percent by weight--and the increased risk of catalyst failure from it, GM officially advises that E.O.S. is not intended for long-term use. View Related Article
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