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Old 08-19-2014, 12:01 PM   #12
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Join Date: Oct 2011
Chapter/Region: NESIC
Location: Eastern Connecticut
2011 Forester 2.5X
Dark Grey Metallic


Originally Posted by bluesubie View Post
It's possible for PU 5W-30 to remain a 30 grade, but don't hold your breath. I know there was a nice trend from a stock WRX (mainly highway mileage) a while ago with PU 5W-30 staying in grade. This is from an EJ engine:

Your best shot of any 5W-30 oil remaining in grade is to use a Euro xW-30 or adding a couple of quarts of PU 5W-40. Over time, oil can actually thicken back up but the only way to see this is uoa's every 1k miles without adding oil to replenish the sample. The highway driven WRX I'm referring to above did ~7,500 mile oci's.

I don't think I've ever seen a factory fill "5W-30" Subaru uoa come back as a 30 grade (even in an N/A Outback). I suspect the oil is an extremely light 30 grade or thick 20 grade.


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For now, I will not run with Euro since the viscosity is higher than whats recommended. The Ultra Platinum Euro is a 5W-40 and has a cSt viscosity of 13.2; much higher than a 30 weight. Like I said, I have seen the Ultra Platinum work in a N/A engine so I'm giving it a chance in this new engine. I can't find the UOA that shows that at the moment.
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Last edited by wiUFsh; 08-19-2014 at 01:47 PM.
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