I'm currently using the Aeroshell 15w50 in both the skyhawk and the 170 ... have had great results so far. No experience with anything else, and as long as things go well I don't guess I'll switch. I buy it in the gallons and it is a little cheaper...
My A&P buddy that flies a C-140 and an RV-6 with O-320 uses the phillips XC and loves it...
Thomas
-8 wings
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