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Posted by platinumist on June 18, 2021 at 11:39 AM
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In Reply To Greg at SZ recommended 20w-50 years ago...> posted by 5150Z on June 18, 2021 at 11:29 AM
     
Message Specialty Z just tuned me in January at 620whp, and they recommended 0w40, so that's what I am running. They attribute the cold weight to getting oil in the heads as quick as possible on startup. The oil will be in the warm temperature rating very quickly.

That being said, I know a lot of people running 20w50 with success. ZShack can attest to this.

     
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