ZDDPlusTM Tech Brief #8 - The Automotive and Oil Industry vs. the Aftermarket Viewpoint on ZDDP
There are some automotive industry representatives who are addressing the “flat-tappet and ZDDP” issue by claiming the whole situation is hype, and there is nothing to worry about. Some say the ASTM Sequence III tests are adequate to ensure an oil which will pass that test will protect all flat-lifter based valve trains. On