A good mileage is about 2,000, to switch. The engine parts are well set by then. Mobile 1 is the factory fill on a Corvette and has been since 1992, at least. 5W30 is recommended, and will get better gas mileage by the friction reduction which will occur in the engine.
In my first use of Mobile 1 in a Honda years ago, the changes to Mobile 1 resulted in a 400 RPM increase at idle. The car's idle had to have the idle adjustment screw backed off to return to the 750 RPM idle speed. That sold me on Mobile 1, and since switching years ago, I have never had an internal engine problem.
One other switch that will help the H3 engine, is to switch an E-0773 K&N Filter.
Mark923
Mobile, Alabama
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