Not to highjack the original thread. I wonder if it got resolved?
Ferm, 50:1 is enough, I know, but I can't help but think I get better life out of my 40:1 mix. I too have run Penzzoil, never let me down. Both oils, smoked like an old oiler at idle. Not like running double oil for break-in. You think 40:1 is a damaging level of pre-mix? Viscosity? not much due it couldn't flow enough volume thru the fuel lines on the old 250 EFI Merc. It is incredible how much fuel it could go through in a hour, full tilt, with a big prop.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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