A VERY SPECIAL DILUTION OF ZDDP ADDITIVE Developed for Older Performance & Classic Cars

zddplus is the only additive which reestablishes the zinc and phosphorus concentration required by engines built prior to 1988 with flat tappet cams. In order to comply with EPA regulations, domestic motor oils have removed the zinc and phosphorus used in these older cars for over 70 years.

This reduction of these additives is due to the EPA's desire to extend the life of emissions control devices (catalytic converters). Adding this 4 ounce bottle to your oil change will bring your current oil's ZDDP back up to the 0.15% level available in the oil that was supplied with the vehicle when new.

In addition to bringing your ZDDP back up to the proper level, zddplus alters bearing and journal surface characteristics to prevent metal-to-metal contact in high stress boundary lubrication conditions. It also helps reduce the tendency of parts to scuff or gall under heavy loads.

zddplus is compatible with any engine oil, including synthetics, and can be added at the same time as your conventional or synthetic oil. It is important to note that this product should NOT be used in OBD II vehicles since it may prematurely erode their catalytic converters. The shelf life of zddplus is many years, as long as it is kept sealed and stored where temperatures do not exceed 120 degrees.