Quote:
Originally Posted by vwalburn
Should the question be asked as to how many miles a person drives their flat-tappet engines between oil changes in regards to how much ZDDP is needed? I've heard that there is enough ZDDP in regular oil for around 1000 - 1500 miles on an oil before more ZDDP would be needed. And, how it is driven i.e. - casual street driving vs. racing. Just some thoughts.
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The ZDDP level would be could for the service life of the oil, and depending on the filter, that could be anywhere between 4,000 and 40,000 miles. Too much ZDDP is bad, and running racing oil in a street engine is bad, as it doesn't have the additive package needed to protect a street driven engine.