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2020 STI. #5413606 04/26/20 11:50 AM
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electricmarquis Offline OP
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So comming up on my 2nd oil change. First was factory fill drained at 1000miles. Then the dealer gave me the first change which of course is Subaru Syn 5w-30. This will be drained at the 3000 mile mark. I ordered OEM Subaru filters and went to Wallyworld and found Castrol 0w-40 Euro formula. I heard this would shear to 30wt standards after a few thousand miles. I have searched for UOAs with this oil but found the 0w-30 UOAs. I plan on doing 3000 mile oil changes till about 9k miles. Then doing oil tests to see if it can go to 4-5k, which would be a once a year OCI. This is a garage car, only driven for fun and occasional trip to work.

Any flaws in this plan.

I chose the 0w-40 because its $22 and readily available. The other plan was Motul but cant seem to find it on any shelf around me.

Car is stock and will remain stock. I like all my parts#s to match the factory service manuals.

Last edited by electricmarquis; 04/26/20 12:01 PM.

2020 Subaru STI EJ257
2019 Subaru Impreza Sport FB20
2014 Dodge Durango 3.6 Pentastar
Re: 2020 STI. [Re: electricmarquis] #5413645 04/26/20 12:16 PM
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mahanddeem Offline
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Good plan it seems. You're liking the sti so far?

Re: 2020 STI. [Re: electricmarquis] #5413670 04/26/20 12:27 PM
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electricmarquis Offline OP
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I had a 2015 WRX before. This car just feels alot more refined in build quality materials. The transmission alone is worth it to me as the WRX 6-spd was junk feeling. The gears felt really short. The FA20dit engine always had some fuel in the UOAs. I have followed Subaru since the Colin days of WRC around 1990


2020 Subaru STI EJ257
2019 Subaru Impreza Sport FB20
2014 Dodge Durango 3.6 Pentastar
Re: 2020 STI. [Re: electricmarquis] #5413675 04/26/20 12:29 PM
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simple_gifts Offline
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Perhaps M1 ESP 5W-30 is another good choice?

NAPA often has it on sale for $5.99/qt w/ free shipping

Enjoy!

Last edited by simple_gifts; 04/26/20 12:30 PM.

2004 Prius; 131K; ATM
2007 Yaris 108K ATM
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Re: 2020 STI. [Re: electricmarquis] #5413687 04/26/20 12:36 PM
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skyactiv Offline
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That Castrol is Porsche A40 approved and is an excellent choice in an STi. I owned an 07' WRX. Subaru use to recommended using a heavier oil under certain conditions and your 2020 manual probably says the same thing.
The 2.5 STi engine is very long toothed and prefers a thicker oil than a energy conserving 5W30. The old 2.0 bugeye WRX's didn't fare well using 5W30. Awesome car btw!


Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: 2020 STI. [Re: electricmarquis] #5413748 04/26/20 01:30 PM
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Cujet Offline
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You will likely see less shear if you choose an oil without a huge spread. OW-40 is achieved with pour point depressants and viscosity index improvers. Neither of which are superb lubricants. Quite simply, I've had better long term results with M1 10W-30 than any of the 0W-30/40 oils.

The KTM motorcycle guys using a 5W-50 note that it shears to a 30 in about 1000 miles. Contrast that to the 20W-50 synthetics that hold up for 3000 miles in the same bike.

Last edited by Cujet; 04/26/20 01:32 PM.

People who count on their fingers should maintain a discreet silence.
Re: 2020 STI. [Re: electricmarquis] #5413812 04/26/20 02:52 PM
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electricmarquis Offline OP
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Just reading all the STI forums on EJ oil issues gives you a headache. Sooooo many opinions and only some with UOAs. You can see 10 peoples EJ with same oil and miles and UOAs all over the place. Almost all from Blackstone. Majority from the enthusiast crowd stay away from Subaru 5w-30 but they are also modded dropping 300-500hp. I just want it to stay stock and last. Plus the 2019+ now have a new piston design with thicker crowns and beefy wrist pin support. This increase the piston weight.

I have the 0w-40 on the shelf. I will use it at 3000, then at 6000 do oil test and every other OCI.


2020 Subaru STI EJ257
2019 Subaru Impreza Sport FB20
2014 Dodge Durango 3.6 Pentastar
Re: 2020 STI. [Re: electricmarquis] #5413868 04/26/20 04:12 PM
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MrWideTires Offline
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You made an excellent choice on oil. STIs love 0w40 and 5w40.

I’ve owned STI for 14 years now and they’ve been flawlessly reliable, and my current one has 500hp.. still doesn’t even burn oil.

You just have to make sure to keep the rpm up, these cars absolutely HATE low rpm.


2015 Subaru WRX STI
2011 Lexus GX460
Re: 2020 STI. [Re: electricmarquis] #5413886 04/26/20 04:33 PM
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electricmarquis Offline OP
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I see that Mobil 1 has a 0w-40 euro oil also. I would like to see uoa on that with a ej257. That stuff is available at Costco and they do $8-12 off sales per 6 qt case.


2020 Subaru STI EJ257
2019 Subaru Impreza Sport FB20
2014 Dodge Durango 3.6 Pentastar
Re: 2020 STI. [Re: electricmarquis] #5414302 04/27/20 07:29 AM
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bluesubie Offline
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Edge 0W-40 is a good choice and it shearing to a 30 grade is better than a GF5/RC 5W-30 shearing to a 20 grade, IMO. I switch to Edge 10W-40 HM during the summer because my FXT has been an oil burner for the past ~120k miles. I have no doubt that Edge can handle once yearly OCI's, but make sure you're dealer is ok with the interval since SoA recommends time or miles. 6 months or 6k miles, whichever comes first.

Enjoy the STI!

drive


Last edited by bluesubie; 04/27/20 07:30 AM.

'20 Subaru Outback Onyx XT | Idemitsu Zepro 0W-20
'04 Subaru Forester 2.5XT | Castrol Edge 0W-40
Re: 2020 STI. [Re: electricmarquis] #5414392 04/27/20 09:05 AM
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electricmarquis Offline OP
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Well twice a year is no big deal for me. I have a lift in the garage. The OCI would be like 1000 miles though.....seems like a waste.


2020 Subaru STI EJ257
2019 Subaru Impreza Sport FB20
2014 Dodge Durango 3.6 Pentastar
Re: 2020 STI. [Re: electricmarquis] #5414570 04/27/20 11:48 AM
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I'd use 5w-30 ESP and chance once per year. After shearing it is basically the same viscosity as the 0w40 and it is cleaner oil, you will have less carbon buildup.

Re: 2020 STI. [Re: electricmarquis] #5414834 04/27/20 04:51 PM
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electricmarquis Offline OP
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I have been told that Mobile 1 5w-30s do not perform well in the ej257 engine and they shear below a 20wt.


2020 Subaru STI EJ257
2019 Subaru Impreza Sport FB20
2014 Dodge Durango 3.6 Pentastar
Re: 2020 STI. [Re: electricmarquis] #5414855 04/27/20 05:32 PM
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kschachn Offline
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Originally Posted by electricmarquis
I have been told that Mobile 1 5w-30s do not perform well in the ej257 engine and they shear below a 20wt.

I wouldn't use Mobile 1 oil anyway.

But then people hear all sorts of things.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
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2000 Toyota ECHO, 284K
Re: 2020 STI. [Re: kschachn] #5414872 04/27/20 05:49 PM
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4WD Online Confused
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Mobile phones are more common

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