ZDD plus engine oil additive, use one 4 oz bottle per oil change to replace zinc and phosphorus not contained in current production motor oil, but needed to lubricate older lifters. Enough for either 5 or 6 quart systems.

WARNING This product can expose you to chemicals including benzene which is known to the State of California to cause cancer, birth defects or other reproductive harm. for more information, visit: www.p65warnings.ca.gov.