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Originally Posted by PaleMelanesian
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That's a joke, right? Two data points show a conclusive trend?
Look at figure 12. You'd expect heavier oil to be more "inefficient." Those three data points show no trend at all.
Further, text right next to figure thirteen - "This was the only regime in which the full synthetic was found to outperform the mineral oil."
The only conclusions of this paper are that for this engine - there's no statistically substantial claims to be made for any oil of the 12 tested. This was primary an emissions study, conducted at one set of operating parameters on one engine. Not a fuel consumption study on multiple engines or a range of operating conditions. Not an engine wear study on multiple engines over broad operating conditions. It was primarily a friction modifier study - and using different types and grades of oils was a way to incorporate this.
Consumer reports did a study years ago using NYC taxis. 100s of thousands of miles on motors using one oil vs another. Huge population sizes of engines (same engine, same car) measured before and after service...that was a wear study.