I have enough of the old Rotella formula for one more oil change and then I think I will switch over to Castrol Syntec 20-50 as the Syntec appears to be formulated for older cars requiring more zinc. Its available at Walmart for a good price too. I am assuming Castrol Syntec is dyno oil?? Or is it synthetic?? I will not run synthetic or a blend.
this is from the Castrol web site. Wonder what/where this "R" formula is available?
Quote:
…to the classic choice
As well as industry-leading products for the latest motor cars, we continue to supply the classic Castrol 'R' grades in some countries. These car motor oils are still in great demand by enthusiasts in many motorcycle sports, classic car and historic car circles - and have been used by manufacturers' teams and private competitors to win countless national, international and world championships over the years.
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