PickyEars81
Super Member
No telling what Pioneer used back in those days...but looking at the owner's manual it seems they wanted you to use the same oil that they used for lubricating the motor to be used in the main bearing...that's fine, I guess, but since mine takes 3 minutes (without the belt on the motor pulley, of course) to spin down from approximately 60 RPM now using the Castrol Syntec gear lube I'm not too worried about friction....
I use 85/90W synthetic in most bronze bearings and have had no problems whatsoever, the EP additives that are in hypoid lube should also help guard against scrubbing on the thrust receiving side of the bronze bearing better than oils that do not have the same...but, synthetics are slippery, I'll give them that..the thicker lube may add a bit of damping, too, but it's all conjecture...
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I have been using Hoppe's Gun Oil.