Glass beading an aluminum intake on the bottom side is a big no no. The glass embeds in the aluminum then when the motor gets hot the aluminum expands and drops all the glass right in the oil and trashes the bearings. Kinda like liquid sandpaper. To much zinc in the oil will corrode the journals on the crank. Vr1 oil has 1400 ppm of zinc in it. Zinc doesn't get corrosive until you get over 2000 ppm of zinc Lucas oil is the only one with that much zinc in it. I personally wouldn't add a break in additive to VR1 but I highly doubt that is your issue. If you grind the crank in the wrong direction it will leave burs stand up in the wrong direction and the points will trash the bearing 2... If the crank is ground in the right direction the points on the burs will just lay over. We are talking stuff that needs to be seen with a microscope / magnifiying glass. Just ask anyone who knows what they are doing.

Are you saying Lucas oil is corrosive?

Ken

I'm saying its right at the limit. I don't really care for it. Seems like water to me.

my understanding also