FA20DIT Engine Oil

I would stick with the Subaru oil. Tune or not.

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Everyone has their own preference, but when you get down to it as long as it's synthetic, meets manufacturer recommendations, and you check and change it, you're not going to see much (if any) difference. Not that it matters, but I use Castrol Edge and WIX filters in all of our cars (except for my WRX, but it's far from stock and not a daily at all).


For some reason Mobil 1 5w-30 seems to have shear issues in turbo applications for some people.. and the standard Royal Purple generally has poor performance and is over priced.

I had the Subaru 5/30 oil tested by blackstone. I'll post the PDF later if I can.

I use Subaru's oil too, but I've heard of a lot of folks using Amsoil.

MainFrame said:

For some reason Mobil 1 5w-30 seems to have shear issues in turbo applications for some people..

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i was aware of that, i have read that can also be an issue with the Subaru Syn oil. Then again i have also read that Subaru oil is repackaged Castrol Edge.

why2kmax said:

I had the Subaru 5/30 oil tested by blackstone. I'll post the PDF later if I can.

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that would be great!

https://forums.nasioc.com/forums/showthread.php?t=2714154

i went for Mobil 1 ESP Formula 5W-30 Motor Oil

The only way you can determine what's best for your car is to have it all tested by a uoa and pick the one with the best results. I would have a uoa done on your factory oil, if they say your good to go run with it.

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Penzoil Synthetic . . . and the OEM oil filter.

I have been using the wal-mart oil since first change. Oh and I change at 8-10K intervals. 39k now. We'll see how it goes. Don't do what I do, though, until i get to 200k.

That's a pretty good analysis. When they are telling you to expand your oci that's good

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anarekist said:

https://forums.nasioc.com/forums/showthread.php?t=2714154

i went for Mobil 1 ESP Formula 5W-30 Motor Oil

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thats a informative link, i had read through it before.

rqjoe said:

I have been using the wal-mart oil since first change. Oh and I change at 8-10K intervals. 39k now. We'll see how it goes. Don't do what I do, though, until i get to 200k.

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are you attempting to test the limits of your engine or warranty?

XJman said:

That's a pretty good analysis. When they are telling you to expand your oci that's good

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i was thinking the same thing, im not sure what numbers he could improve upon.

clt-wrx said:

are you attempting to test the limits of your engine or warranty?
.

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No, just think oem intervals are conservative. Especially for the way I drive. So far on all my cars i've been right. I guess I have no reason to think wrx is any different.

A lot of people are enjoying the Pennzoil Ultra Platinum on the FA, but I'm sure Subaru oil is great too

I run Eneos 5w-30 in my STi.

Everyone keeps referencing "Subaru oil," but who is the actual oil manufacturer? It's not Subaru. FWIW, my dealer uses Penzoil.

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my comments on my UOA were not necessarily related.

I expected better/lower numbers in the metals in that I assumed the break-in residual metals would have been washed out by now. Best case this shows they arent. Worst case (if they are) something is causing the elevated aluminum levels.

I like to see the viscosity numbers within range. These are a bit low.

Im trying the penzoil ultra platinum because thats what I have on the shelf right now, it has been good oil for my other cars and I drive enough to get results within a relatively short amount of time.

zax said:

Everyone keeps referencing "Subaru oil," but who is the actual oil manufacturer? It's not Subaru. FWIW, my dealer uses Penzoil.

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Not sure if it changed, but subaru oil used to be produced by castrol.

In my previous Corollas which were from a Toyota dealer I went with OEM based oil. Found out it is actually Mobil 1 mfg for Toyota. It would be interesting to find out about OEM Subbie oil.

I was going to go with the OEM Subbie oil but after seeing that the ‘gallon’ they offered was a 4 qt gallon, I decided to go back to Castrol Edge. I used the gold Extended Performance with GDI Turbo due to the ‘17 being an oil cooled turbo. My plan is to stick with Castrol.

On top of that my Toyota dealership said they’d use my oil and my filter and for $20 change my oil. Can’t really get better than that.

I noticed that there hasn’t been much talk about Motul. My tuning shop swears by it and I’ve been using 8100 X-Clean EFE 5W30 for my last 3 oil changes. Seems to work just fine, operating temperatures for daily driving look about the same. I change every 5000 miles almost on the dot.

I used to use Mobil 1 full synthetic, but after seeing a number of reviews about how it doesn’t play well with TGDI engines I decided to switch. I’ve also stopped using their filters and switched to OEM Subaru filter.

Some people have talked about how Motul isn’t an engine oil that prevents pre-ignition, but when you ask why they normally give an asshole response and don’t really explain anything. If anyone has more info on this I would interested to learn.