Originally Posted by paoester
Originally Posted by Mad_Hatter
SN rated lubes for pcmo's are gonna have the zinc capped no matter the brand. Find a diesel 10w30 like Motorcraft Super Duty if you want higher zinc.
Not 40 and 50 weight ones. Example: Mobil1 15w50 is SN and has high zddp, 1200 ppm, up there high. Cheap in 5 quart jugs at walmart.
(The M1 0w40 at walmart would also work well in this application, another SN oil at 1000 ppm zddp, somewhat high.)
You are correct, anything above a 10w30 (like race oils) is exempt from the low phosphorus requirements of API SM/SN.
If the OP wants to run a 10w30 with high zinc, a diesel oil is gonna be his best bet IMO. Or find some pre API SM oil south of the border....
Originally Posted by Mad_Hatter
SN rated lubes for pcmo's are gonna have the zinc capped no matter the brand. Find a diesel 10w30 like Motorcraft Super Duty if you want higher zinc.
Not 40 and 50 weight ones. Example: Mobil1 15w50 is SN and has high zddp, 1200 ppm, up there high. Cheap in 5 quart jugs at walmart.
(The M1 0w40 at walmart would also work well in this application, another SN oil at 1000 ppm zddp, somewhat high.)
You are correct, anything above a 10w30 (like race oils) is exempt from the low phosphorus requirements of API SM/SN.
If the OP wants to run a 10w30 with high zinc, a diesel oil is gonna be his best bet IMO. Or find some pre API SM oil south of the border....
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