I belong to a club for older British cars, the cars are manly used weekends during the summer, so there are often long intervals between starts, being British some also tend to leak oil, so thin Synthetics are not widely used, most of us run a standard 20w-50. What would be the best oil to use? Seems to me modern SL formulations may not be optimal, and it has been suggested that Rottla might be a better choice. I have a lot of faith in you Guys. What does 'Dino' mean?