yankees1,
Normally, I encourage people to try out synthetics, even on higher mileage autos, but given the vintage of your Vette I would approach with caution. My concern is your seals. What you could do, if your car is not a "leaker" or a "burner," is run a test interval on synthetic--I wouldn't go anything less than a 10W30--and see what happens. I don't think you will "hurt" anything...you might just end up draining it quicker than the cost of the synthetic justified if you don't like the results...but if it does work, you're set
I think your best course is to watch this thread for a while and hopefully our "seal experts" will clarify whether seal material in '72 was such that you could have a problem with synthetics. Then you could make a solidly informed decision.
[ August 14, 2003, 06:50 PM: Message edited by: pscholte ]