Torco Zinc Enhanced Engine Protector (ZEP) is an oil additive specifically designed for older engines without catalytic converters.Modern oils offer less protection to older engines because zinc, the anti-wear chemical, is purposely removed to prevent damaging the catalytic converters used in later vehicles.Torco ZEP contains Torco MPZ which is a perfect balance of molybdenum, phosphorous and zinc to put wear protection back into your oil.ZEP coats all engine parts and protects them from oil starvation on start up, which is a leading cause of engine damage in vehicles kept in storage and driven infrequently. ZEP won't rub off, wear off, scrape off or scuff off. It is excellent for high-performance engines.Features of Zinc Enhanced Engine Protector - Puts wear protection back into your motor oil Protects engines during dry starts Protects engines during storage Increase mileage and horsepower Extends engine life and reduces repairs  Supplied in a 335 ml bottle. 1 bottle will treat an en