I use Mobil 1 10w40 myself. While I don't see Rotella hurting anything, I'd stick with a gas-formulation.
As an aside, many guys with old gas Mercedes swear by Chevron Delo for their cars.
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-Chris
2004 Porsche Boxster 2.7
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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