Hi Scotty I have a 1972 Oldsmobile Toronado that has a 455 olds v8 with 100,378 miles and it’s all stock never been taken out from the car. I’ve wanting to use full synthetic motor oil (with maybe Lucus oil stabilizer or stp) in the toronado because it has better anti wear properties then conventional oil but I’ve git mixed responses of using ether synthetic or conventional oil on a vintage car. What’s your response to this and also how do you feel about Oldsmobile Toronados? Thanks
I use full synthetic oil in my 1965 and 1967 Ramblers and have not had any issues. (However I do not use modern weights such as 0W16, 5W20, etc. and stick with 10W30 or 10W40 weights which are still readily available.)
The only real problem would be if you have worn engine seals. Synthetic oil flows more readily than the conventional type which can result in leaks with marginal seals.
Don't use the full synthetic oil in that old car, just stick to conventional oil.
Clip from Scotty on using synthetic oil in a old car:
https://www.youtube.com/shorts/wCHNoBiJBBk?feature=share
