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I do have a theory that driving on highway consistently at the natural frequency of our engines (~3850rpm) may contribute to more oil usage vs keeping out of this range.
I tried two drives, one stuck at this RPM for 1.5 hours, and on the way back avoiding around this frequency. On the way there I burned half a quart. In the way back, none.
Not sure if it was conincidence or not, but curious if hitting the natural frequency of the engine for extended periods allows oil blowby / burn due to vibration.
Probably pie in sky, but interesting results.
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