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Originally Posted by bmussatti
Richard, your're right, Mobil 1 0W40 is not an "energy conserving" blend. I think any oil above a 40 is not one. My past exprience shows a 1-2 MPG drop from a 10W30 or 5W30 vs. a 10W40 in a non-Porsche engine.
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Interesting! Was the 10W-40 a synthetic oil or DINO?