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I have been researching my options and have decided to go with rotella t 6. Your help is greatly appreciated.

65 mustang and a 71 cutlass

Where can I buy GC?

What is GC?

What was the grade of gear lube used in the differentials of cars in the mid 60's? What would be the best modern replacement?

What types of modern oil would be the easiest on the seals in my 65 Mustang?

Does anyone know the ppm of ZDDP that was in the old API SF oils?

Mobil 1 high mileage oil has a API rating of SL/CF. Does this mean that it has 1200 ppm ZDDP in it? I think the SM rated oils have no ZDDP in them.

Mobil 1 high mileage has an API rating of SL. Does anyone know if oil has 1200 ppm ZDDP in it? I think the newer SM oils do not have ZDDP at all.

Is there a down side to using a synthetic oil after all these years?

My 65 Mustang has a 260 V8. I rebuilt the engine in 1997 and it has about 30K miles on the rebuild. For the last 8 years I have used the car less than a thousand mile per year. Since I use the car so infrequently I am worried about start up engine wear. Would it be alright for me to use a 0w30...