Originally Posted by FA_WRX
Originally Posted by jbutch
Originally Posted by FA_WRX
Hello,
I was trying to find some uoa's on 5w-30 oil for this engine. Did not seem to have much luck using the search.
I have tried two different oils and did uoa with them with my Forester XT (same engine). Here's the latest one (see page 2 for update):
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4913012/1
Pennzoil was causing high copper for some reason.
Quaker State Ultimate Durability is the best for my engine so far. I didn't try any of the boutique oils yet.
Thanks Jbutch. I have a couple of UOA's to post using Valvoline FS HM and Valvoline with Maxlife. Both also show slight fuel and a lower than desired viscosity after 6K miles. Wear metals look fine otherwise. It would appear these motors due shear oil.
This engine seems to be very hard on oil, due to fuel dilution (mostly because it's TGDI) and the turbo.
All the oils I put in sheared to a 20 grade. QSUD with with a higher visosity held up the most.
I would recommend 5k miles oil change at most with a good synthetic. They are pretry easy to change oil anyway!