Voodoo in a can. I doubt all of those claims. Most of them claim they fill scratches and grooves in worn engines. Some grooves are required (lifters and such). Other claims include viscosity and lubricity enhancement, cooler temps and stops leaks. Correct maintenence takes care of those issues before they happen.

Worn engines are just that.

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Satan creates nothing: he only ruins everything. He does not invent: he tampers. And his followers are no different ~ Archbishop Carlo Maria Vigaṇ