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I run Mobil 1 because I started using it about 10 years ago when I think it was the only readily available synthetic. But I wouldn't have any major heartburn about using
any other good brand. Change it regularly and change the filter at the same time. You'll be ok.
 

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One other thing... some of the more expensive synthetic oils have higher levels of zinc. Zinc is a great anti-wear additive, but long-term it can accumulate in the cats and plug them up. Now whether or not that's an issue with the IS300 we won't know for a long time.

Mobil 1 has been "decontented" (less additives) over the years at the request of major manufacturers (also makes it more profitable for Exxon, that's their money-maker).

What am I getting at? I don't know.... well, it's just that having THE BEST may have long term side effects. Too many additives could be a bad thing.

I say just use a $4-5/qt synthetic (they're more similar than different) and change it on a regular basis.
 
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