1956 Y block oil requirements

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Synthetic oils are very good at cleaning your engine intervals. That being said, if you have a high milage engine it may loosen any carbon build up and cause you to begin burning oil or leaks. On a fresh rebuild it would be ideal.
 
Please include the model year in the subject when posting. I updated it for you.
 
My car is a 1956 with 312 engine - intent of my question is the addition of LDDP!
Put the model year of the car in the subject when you post. Thanks. I updated it for you.
 
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