The best replacement for zddp is moly.

The best alternatives to zddp are rated as following:
★★★★★  moly
★★★★  mos2

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Speaking about zddp, one probably shouldn't forget about synthetic oil.

Other search terms related to zddp and their ratings are:
★★★★★ synthetic oil
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Google Trends

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zddp
moly
mos2