I've searched here, but don't seem to find any threads regarding which oils to use. I've seen references to ZDDP and read on the GTO forum where synthetics are unsuitable for our vintage ehgines, but nothing specific. I always used Kedall GT-1 racing oil back in the day, 50 weight as I recall, for racing. It's my understanding that the formulation of that oil now is nothing like it was 40 yrs. ago. Do any of you have recommendations for the occaisional use I expect my engine to see when and if it's up and running again? The Brad Penn oil, one of the listers mentioned, appears to be close to the original Kendall GT-1, so I'm leaning toward it.
