I hope this is in the correct area. A good friend of mine told me to use Shell Rotella oil in my 1955 235 stock 6 cylinder, as it was most like oil of old.

With that information, I purchased some only to find out when home I purchased some for a DIESEL.

What does this matter?

What's the difference?

Should I use it?

Was my friends information/suggestion good information?

Thanks

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