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Best Weight Oil for My '59 100-6?

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hundredsixinsf

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I'm in the process of changing the oil in my '59 100-6 and am wondering what weight oil I should use. Mileage on the engine is unknown, but it shows 60psi at startup and doesn't smoke. Would Castrol 20/50W oil be ok? I live in San Francisco, so it never gets too cold or too hot here.
 
Yes Castrol 20/50W is an acceptable oil for use In your car.---Fwiw--Keoke
 
Keoke said:
Yes Castrol 20/50W is an acceptable oil for use In your car.---Fwiw--Keoke
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Make sure that it is Castrol GTX 20-50. Some other types of Castrol now have reduced levels of Zinc which can be harmful to cams & lifters. See the following posts on this subject:

https://www.britishcarforum.com/bcforum/ubbthreads.php/ubb/showflat/Number/227064/page/6#Post227064

https://www.britishcarforum.com/bcforum/ubbthreads.php/ubb/showflat/Number/227063/page/7#Post227063

https://www.britishcarforum.com/bcforum/ubbthreads.php/ubb/showflat/Number/227062/page/7#Post227062

Valvoline VR-1 20-50 also has the needed levels of Zinc.
D
 
That is true Dave, However, Castrol has been dumping their unmodified 20X50W oil on the market at $1.59/Bottle. This issue of their oil does not contain "Energy Conserving" in the API Circle. Most dealers have picked up on this oil change and are charging $4.00/Bottle for Valvoline VRI oil. But I did find it at Auto zone for $3.00/Bottle---Keoke
 
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