VPI is so easy to contact, and get answers from, direct from the horse's mouth so to speak. Email them, and I'd bet you get a reply lickety split from Mike within 24 hours.
I would garner an educated guess, regardless of 300rpm, or 600rpm, many of the Motors VPI has used, has been Hurst AC Synchronous, and I would think a Synthetic Motor Oil, such as Mobil 1 5-30W, 10-30W, 30W, or 40w would be fine.
Just use only one drop, that's all it takes. Repeat in about another 3-5 years. Mark
I would garner an educated guess, regardless of 300rpm, or 600rpm, many of the Motors VPI has used, has been Hurst AC Synchronous, and I would think a Synthetic Motor Oil, such as Mobil 1 5-30W, 10-30W, 30W, or 40w would be fine.
Just use only one drop, that's all it takes. Repeat in about another 3-5 years. Mark