Of course synthetic is better, but it seems to me that regular oil is fine, and you need to change is often enough to get rid of water and acids, so that you don't really need synthetic.
Personally I also prefer 10W40, because it holds up better on heavy wear, like on the camshaft. But 10W30 gets slightly better mileage.
There is no need for synthetic. A brand name 10W30
conventional or high mileage oil will be fine.
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