I originally used AeroShell; 80 in the winter, 100 in the summer and straight mineral when I changed out cylinders, which seemed to occur regularly when I first bought my TriPacer back in '95. All of which meant I needed to keep 3 grades of oil on hand. The Phillips rep at OSH 2000 gave me the sales pitch on Phillps XC. You can use it from break-in to overhaul year-round. That did it. I've used XC ever since. Same price as AeroShell and oil consumtion improved to 7 hrs/qt (was -6). Coincidentally, I never replaced cylinders after
2000.
Not a paid endorsement,
Steve
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