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Old 05-07-2012, 11:34 PM   #406
kingme
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Member#: 280943
Join Date: Apr 2011
Location: Northeast
Vehicle:
'11 WRX

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Gordy, do you plan on analyzing your oil? I'm curious if the new tune is rich for safety, causing your lower mileage. A UOA might show high fuel dilution which would lower flashpoint and viscosity. Maybe the tech recommended 5W-40 because he knew a 5W-30 would be further weakened by fuel dilution.

Of course, this assumes the tech knew anything about your special tune . Regardless, still curious.
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