M21 Oil Weight/Brand Recommendation

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TDW · #1 09-16-2013, 09:06 PM

Sam, I did some research on this a while back. What I found and use in all my Muncies is Pennzoil Gearplus SAE 80W-90W GL4. The GL4 works best with the brass syncros.

**Salvatore** · #2 09-16-2013, 09:38 PM

good choice Tony.

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