In terms of oil, I now use Motul's (French) 300V 20W-60 Ester core racing oil, since the car is not a daily driver. Motul's ester core oils (300V line) are based on vegetable oil, have the greatest polarity for clinging to parts, reduce wear & friction, withstand extreme temperatures & pressure during racing, reduce consumption, and increase fuel efficiency. Regarding the vegetable oil issue, the "idea" is what happens to butter (e.g. fossil-based oils or synthetics with fossil base stock) vs. vegetable oil in a frying pan on high heat for 10 minutes -- this is the idea, but not precisely what happens (complicated). The esters will cling to parts better to reduce scarring during "cold" startups if I happen to drive only once a month. It's not cheap however, and cost me 34USD per 2 liter can from Amazon. I needed two 2 liter cans during the latest oil & filter change, so about 70USD per change.
Ester-based oils (like 300V) are used by F1, Indy, Team Porsche Racing etc., see example review
here
An image of a 2 liter can of 300V is shown below:
