Cam-shield™ brand engine oil additive provides premium ZDDP anti-wear protection for camshafts, lifters and valve trains in your classic car, hot rod or race car. Add Cam-shield™ to any conventional or synthetic engine oil to raise the ZDDP concentration to the level required for protection of historic flat tappet cam engines or race engines.

Each half-ounce of Cam-shield™ is guaranteed to deliver an additional 1600 ppm of Zinc (from ZDDP) to a quart of your favorite engine oil. If you wish to add 800 ppm of Zinc (from ZDDP) to a quart of your favorite engine oil, simply add a quarter-ounce of Cam-shield™ brand engine oil treatment to each quart that you wish to treat. Please see the Technical section on Engine Oil that discusses today's API SM/ILSAC GF-4 engine oils to learn the recommended treat rate of Cam-shield™ for you. When using a treat rate of one half ounce of Cam-shield™ per quart of engine oil, the 4 ounce bottle will treat 8 quarts of your favorite engine oil and the 8 ounce bottle will treat 16 quarts of your favorite engine oil.