Re: Recommended oil for a 352 (56 Super)

Posted by Tim Cole On 2022/9/17 8:22:31

Risolone offers a zinc additive and Lucas has a full line of SJ rated oils with the zinc.

One of the reasons I don't like those heavy oils is because at least 40% of the power produced by an engine is used making it go round and round. So if you put heavy oils in that number goes up. Packard recommended heavier oils to control consumption due to worn rings so if the car isn't blowing smoke heavy oil is not needed.

In the ultra horsepower dyno cars we used the 5w-50 and they occasionally blew up. That oil had massive amounts of either viscosity improvers or pour point depressors. But those oils also were low zinc to protect cat converters.