Quote: Does anyone use diesel oil in their classic?
Sure do. Shell Rotella T 15w40 for years, but I've switched to Delo 400 LE 15w40 with 1350 ppm zinc. I add about a half bottle of Red Line zinc additive per oil change for good measure. Last time I had the engine open, about 2 years ago, it looked like new.
Delo 400 LE is an "all fleet motor oil". Meaning gas engines too.
PS, I also mix avgas with pump gas for the lead to lube the valves. 2.5 gals of avgas to 8 gals of pump gas. I also run "clear" premium gas when I can.
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