Girard,
At 80 hrs my top end measured out like new, both compression and dimmension. I replaced it for fatigue reasons and piece of mind. I know you guys have a lot more fine dust down there so maybe that is a factor, but you should have a good baseline from your last two GGs just like me. I have never seen a dry rusty PV in any of my three GGs. Mine is clean but with a good coating of oil. I've run nothing in any GG but Amsoil Dominator @ 36:1.
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