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Old 08-18-2014, 07:59 PM   #1
Scooby Specialist
Member#: 296667
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Eastern Connecticut
2011 Forester 2.5X
Dark Grey Metallic

Default 2015-2018WRX Used Oil Analysis Thread

Post your 2015+ WRX UOAs here!

User yousaid has put together a great post of links that contain UOAs in this thread:

User hotdog has built a spreadsheet of common oils used in the 2015+ WRX as well as the before and after viscosities of the oils sampled in this thread:

Thank you guys!

Since the FA20DIT is brand new to the 2015+ WRX I figured this would be a start to finding out what is the best oil to use in this car. STIs, we already know too much about you so please keep this a non-STi thread.

About the engine during this interval...

This is the break in factory fill. I kept the RPMs under 4,000 RPM for the first 900 miles and then did random WOT pulls to about 5,500 RPM for the rest of the miles along with other normal daily driving. In consideration for the known DIT fuel dilution issues, I let the car idle on cold starts until the RPMs settled to about 1,500 and not any longer. I drove it nice and easy until the oil temp reached about 190 degrees F. My commute to work is short so I made it a point to drive the car until the oil was warmed all the way up (about 200-207 degrees F) and then some extra driving before I turned the car off. This sample was taken warm after about 20 minutes of highway driving. Even though I had a very strong fuel smell when changing this oil, the fuel percentage came out <0.5%. Other than the cSt Visocsity being in the 20 weight oil range (which seems normal for the factory fill based on what I've seen) the rest of it looks pretty standard for an engine that's breaking in. I'm very satisfied with the results.

I replaced this fill with 5.4 quarts of Pennzoil Ultra Platinum 5W-30 and an OEM filter. I will be doing another analysis on the Pennzoil after about another 2000 miles.
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Last edited by wiUFsh; 12-14-2018 at 01:07 PM. Reason: Year Update
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