Re: M21 Oil Weight/Brand Recommendation
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.
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Tony
55 Nomad Gasser
70 SS 427 Nova
34 Ford Sedan..Hemi powered
Michigan/ Florida
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