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Old 05-08-2012, 12:34 AM   #406
Scooby Newbie
Member#: 280943
Join Date: Apr 2011
Location: Northeast
'11 WRX


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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