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question on hp4 engine oil

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Posted by: brian400ex

I had an older quart of HP4 engine oil laying and i bought a new quart today. The new kind doesn't have Moly while the older stuff has moly. Will it hurt to mix the two?


Posted by: 400exRacerX

HP4 contains Moly which isn't the greatest for the 400ex engine. I would run just standard GN4,, thats what I run in my 416.




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