Thanks for the info on the pressure relief valve.

The car has 28k original miles. Hence, I would not expect internal component wear to be a problem with the low mileage. My father purchased the car from the original owner in 1979. I’m not aware of any engine rebuilds having occurred and I don’t see any invoices in the car’s folder for the parts to do a re-build.

I have no idea how the original owner maintained the car. The original owner tallied up around 27k miles. It appears my father was using Castrol RX 15W-40 motor oil. I found a partial bottle of the Castrol oil along with Castrol LMA brake fluid, Sta-Bil fuel stabilizer, and lead alternative fuel additives. My father had multiple classic cars, but it would seem all those liquids were being used for the Alpine.

Do you have any recommendations for motor oil? I’m in the mid-Atlantic region and I doubt I will drive the car when it is below freezing or above 90 degrees. I was thinking 10W-40, 15W-40, or 20W-50 would be appropriate viscosities.