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Just curious, how do you know for sure what the cleaning practices were for the other three sampled vehilces? Because they were all Nissan's, and the manual says to?

Your results are very clear, but I think that it would be more of a controlled test if all the vehicles were in the same exact location, and filter changes/cleanings were all documented. It would seem a little more fair to me.

:twocents:
 
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