So whether it is synthetic or not is not the issue, and you should post that the previous owner of your car had put the wrong viscosity oil in, not whether it was a syn or dino oil.

Your opinion on syn oil being inferior to dino oil tends to disagree with much scientific data as well as 30years of spectro-analysis by me, and by the airlines as well as many of the manufacturers which were requiring it to maintain warranties.

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Gone to the dark side

- Jeff