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I'd agree there's probably not much difference, but I use Mobil 1 FWIW. Tearing down a Subaru EJ22 at 250k miles of being driven like a race driver's rental car revealed little sign of use. All cylinders were crosshatched nicely, main bearings looked good for at least another 100k, and the cams and rockers showed little sign of even being used at all. All but the first 100k miles were with Mobil 1 so I've stuck with it. But I would think any other synthetic brand would also do as well.
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