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68post · 01-20-2022, 01:50 PM

I use HyperLube Zinc replacement additive.
It is a synthetic polymer ester that provides better protection than zddp, doesn't change the base oil's chemistry (won't harm catalytic converters either), and will even provide enough wear protection that you can drop to a lower weight grade.

I've stocked-up several 12oz bottles @ $9.62 ea and you only need 1 oz per oil qt.

01-20-2022, 01:50 PM	#22
68post Registered User Join Date: Jan 2014 Location: Indpls. , IN Posts: 795	Re: What oil are you using in an older flat tappet motor? I use HyperLube Zinc replacement additive. It is a synthetic polymer ester that provides better protection than zddp, doesn't change the base oil's chemistry (won't harm catalytic converters either), and will even provide enough wear protection that you can drop to a lower weight grade. I've stocked-up several 12oz bottles @ $9.62 ea and you only need 1 oz per oil qt. __________________ Tim K. 84 K30 srw Silverado 454 auto 85 C20 350 C6P auto flatbed 94 K1500 lifted shortbed 350 4 bbl NV4500 Last edited by 68post; 01-20-2022 at 01:52 PM. Reason: more