ZDDP Plus Engine Oil Additive Zinc & Phosphorus 10 Pack

Description

ZDDPlus contains the exact concentration (approximately 0.15%) of ZDDP (Zinc DialkylDithioPhosphate) that was available in motor oils under the “SF” category. The motor oils today carry the “SM” category designation. Today car manufacturers must warranty their catalytic converters for 100,000 miles or more. In order to meet this requirement, oil companies have had to eliminate the ZDDP older muscle cars need to protect their flat-tappet cams. ZDDP is not an issue of concern for modern vehicles with roller rockers. The issue arises with older performance cars with flat-tappet camshafts. ZDDP has been an important additive in engine oils for over 70 years and has had an excellent track record at protecting the sliding metal-to-metal cam lifter interface. ZPPD protects by creating a film on the cams and flat lifter contact points in response to the extreme pressure and heat at the contact point.