I bought that same oil a few years ago, impulse buy. When I got home I researched it some, found out that Quaker State wasnt a full synthetic after all, it was a blend but the bottle said it was a full synthetic. In the end, I didnt use it so now I got a couple cases on the shelf just taking up space.
In your case, you may want to research it further before putting it in. Bobistheoilguy.com is a good resource, those guys take oil serious.
As for the 10-40 vs. 10-30, you might want to rethink that one. If you have having an overheat issue, why would you want to put in a THINNER oil? What do you think Terramite would have to say about that? If you are overheating (heat thins oil) you should be going the other direction, say a 20-50 oil. But its your money, take your chances...
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