I run 5w30 Royal Purple. Change it at the end of the year (100) passes.
.003"rods/.0028" mains. Pressure relief is set to 60 psi@7100. I've checked bearing last year and will this year as well. They looked like new last check. Also only run 6-7 quarts in a 10 quart pan. The motor is always warmed up before making passes. Oil temp seldom exceeds 160 degrees.
Doug