Zddp

dusterdan said

is this stuff even necessary with a bone stock slant six? Will running just normal oil (10-30 or 20-50) hurt the motor at all?

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20w50 is pretty thick oil to pump. Some slants have stripped the gear off of the oil pump while pumping normal weight so I wouldn't run the thick stuff. I want to see some scientific study that has proof of the need for zddp.