question on hp4 engine oil [Archive]

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brian400ex

06-10-2002, 07:04 PM

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?

400exRacerX

06-10-2002, 07:12 PM

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.