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Cameo Ivory 1967
3,012 Posts
Man! Gonna be 1000 different opinions here!

As a rule, you break the engine in with the conventional/ non synthetic oil that your builder recommended. This is to break in the cam and seat the rings.

Then you can switch to synthetic if you like... but like I said, dont expect a straight answer or a unified one.

I run 10w40 synthetic blend. My engine builder gave it to me with 10w40 in it
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