Slaw: Your original post indicated that somewhere along the way confusion, or a mixup if you prefer, occurred with respect to what part of the tt the advice was given to. The manual for the Classic is clear as to what lubricant to use and where, and I find it hard to believe anyone at VPI would tell you to use motor oil on the platter bearing. The viscosity of motor oil makes it inadequate for lubricating the platter bearing. Lithium grease is thick enough to stay where it matters unlike oil that would simply drip down the shaft with gravity.
I also find assertions that oil vs. grease makes audible difference rather absurd. Once you get the platter spinning at the correct speed, why would it matter what you used to lubricate it? It doesn't make sense, especially with the SDS. If you can't get your platter to spin smoothly and at correct speed, that's another matter. Just use white lithium grease as VPI recommends once a year and be done with it. I'm sure you can find plenty of other things in your system to experiment with.