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Old 08-02-2019, 02:45 PM   #351
vlad11591
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I had the Fa20 and in the summer I ran t6 5w-40 and in the winter 0w-40 Castrol edge.

I'm switching to an Ej257, can I run the same oil cycle? Also I read in the manual that if 5w30 isn't available a 5w-40 can be run as an equivalent. Would this be an issue for any warranty claims if I run t6 5w-40?
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Old 08-02-2019, 11:13 PM   #352
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Originally Posted by vlad11591 View Post
I had the Fa20 and in the summer I ran t6 5w-40 and in the winter 0w-40 Castrol edge.



I'm switching to an Ej257, can I run the same oil cycle? Also I read in the manual that if 5w30 isn't available a 5w-40 can be run as an equivalent. Would this be an issue for any warranty claims if I run t6 5w-40?


The manual is odd with regards to 5W-40. It mentions 5W40 conventional (which doesn’t exist) and that it’s only to be used for replenishment. It also does show 5W40 on the temp chart. There is also language that oil of a thicker viscosity is required in hot temps but doesn’t define the viscosity or the temps. Possibly being vague helps Subaru with CAFE credits.

The downside to RT6 5W40 now in regards to warranty is that it no longer carries the API gasoline spec. Castrol Edge 0W-40 is API SN.
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Old 08-13-2019, 06:52 AM   #353
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I'm from The Netherlands and I'm thinking of what oil to use.
In harsh winters we can have an occasional night of -15C (5F) and in hot summer we can have temperatures of up to 40C (104F) some days.
5W30 is too thin for summer use in my opinion.
I was thinking of using 10W40 oil to be able to start it in cold winter days and still have good lubrication on hot summer days.

Wat are your opinions?
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Old 08-13-2019, 09:01 AM   #354
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Originally Posted by metalmarty View Post
I'm from The Netherlands and I'm thinking of what oil to use.

In harsh winters we can have an occasional night of -15C (5F) and in hot summer we can have temperatures of up to 40C (104F) some days.

5W30 is too thin for summer use in my opinion.

I was thinking of using 10W40 oil to be able to start it in cold winter days and still have good lubrication on hot summer days.



Wat are your opinions?


In an Outback? You shouldn’t need anything thicker than an ACEA A3 0W-30.
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Old 08-30-2019, 09:45 PM   #355
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I have been using the Shell RT6 for the last three years with good results. I wonder if the loss of the certification is associated with extended oil drains. I have noticed that the factory recommended oil drain interval is longer on newer EJs as compared to my ‘05.
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Old 08-31-2019, 10:48 AM   #356
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Default The NASIOC Oil Selection Guide

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Originally Posted by kawiwill View Post
I have been using the Shell RT6 for the last three years with good results. I wonder if the loss of the certification is associated with extended oil drains. I have noticed that the factory recommended oil drain interval is longer on newer EJs as compared to my ‘05.


The loss of certification is due to Shell being over cautious on phosphorus clogging up cats. Phosphorus is actually slightly lower in the new formula and Shell now has RT6 5W-30 Multi Vehicle. The MV is a great choice for stock DIT’s since ZDDP is lower but the HTHS is high.

https://www.bobistheoilguy.com/forum...M_#Post4490450


Quote:
Hi O5Q45, we do not recommend Rotella T6 5W-40 as the phosphorus for this product is quite higher than recommended for catalytic converter equipped engines. We do have a new Rotella T6 Multi-Vehicle 5W-30 product that will meet these requirements. - The Shell Rotella Team
https://www.bobistheoilguy.com/forum...sm#Post4586441

Last edited by bluesubie; 08-31-2019 at 10:58 AM.
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Old 09-03-2019, 04:30 PM   #357
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ok so just for clarification, I'm about 1k in for engine break in, and will do an oil change fairly soon.

Rotellta t6 no good anymore (warranty purposes) doesn't carry gasoline spec. 0w-40 Castrol EDGE has gasoline spec, however the grade is not covered under warranty.

So rotella 5w30 mutli vehicle is the best bet?
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Old 09-03-2019, 07:11 PM   #358
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Default The NASIOC Oil Selection Guide

Here’s an RT6 MV UOA from an FXT:

https://www.bobistheoilguy.com/forum...-km-4500-miles

It doesn’t meet GF5 but meets API SN.
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Old 09-04-2019, 04:39 PM   #359
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But that's from the Fa20. Idk how worried I should be about warranty claims. For the last WRX I had Castrol edge and t6 based on season, never had issues. I liked 0w-40 Castrol better tbh. my OCI was about 4500.

I'm probably going to run that since it's getting cooler and cooler in NJ at night. I get that Subaru want's to make sure that they are providing warranties on engines/transmissions for the right reasons, but worst case scenario I get ringland and they see I'm using Castrol with the recommended OCI, they can actually deny the claim?
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Old 09-04-2019, 07:50 PM   #360
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Default The NASIOC Oil Selection Guide

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Originally Posted by vlad11591 View Post
But that's from the Fa20. Idk how worried I should be about warranty claims. For the last WRX I had Castrol edge and t6 based on season, never had issues. I liked 0w-40 Castrol better tbh. my OCI was about 4500.

I'm probably going to run that since it's getting cooler and cooler in NJ at night. I get that Subaru want's to make sure that they are providing warranties on engines/transmissions for the right reasons, but worst case scenario I get ringland and they see I'm using Castrol with the recommended OCI, they can actually deny the claim?

Oh STI! I know there are some EJ owners running ACEA C3 oils, which have a similar additive package and viscosity as the RMV, but the EJ’s do like thicker oils IMO.

As to warranty that’s a tough call. The manual does show 5W-40 on the oil temp chart and also has language that thicker oil is required in hot temps. Personally, I don’t think my dealer would give me any hassles if I were in your shoes, and they have gone to bat for me with SoA on a claim, but it depends on your dealer. I was using German Castrol 0W-30 at the time.

Castrol is a light 40 grade and likely shears to a 30 grade in most turbocharged Subaru’s anyway.
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Old 09-04-2019, 10:26 PM   #361
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Oh STI! I know there are some EJ owners running ACEA C3 oils, which have a similar additive package and viscosity as the RMV, but the EJ’s do like thicker oils IMO.

As to warranty that’s a tough call. The manual does show 5W-40 on the oil temp chart and also has language that thicker oil is required in hot temps. Personally, I don’t think my dealer would give me any hassles if I were in your shoes, and they have gone to bat for me with SoA on a claim, but it depends on your dealer. I was using German Castrol 0W-30 at the time.

Castrol is a light 40 grade and likely shears to a 30 grade in most turbocharged Subaru’s anyway.
Hmm.... well T6 has always been pretty good. The issue is that they are no longer gasoline spec with new formula right?... are there any other 5w-40's that are comparable?

Also, i understand the EJ's like to burn oil a tad more than FA20's. People typically run 3k OCI's. Manual recommends 6k. Should i be OK running around 4500?

Last edited by vlad11591; 09-04-2019 at 10:47 PM.
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Old 09-05-2019, 08:52 AM   #362
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Hmm.... well T6 has always been pretty good. The issue is that they are no longer gasoline spec with new formula right?... are there any other 5w-40's that are comparable?

Also, i understand the EJ's like to burn oil a tad more than FA20's. People typically run 3k OCI's. Manual recommends 6k. Should i be OK running around 4500?


I posted the RT6 comparison above. Less phosphorus than before but no more gasoline spec. If you’re worried about the 0W there is also an Edge 5W40 and will be fine at 4,500 intervals. It meets one less spec than the 0W40 so it’s good, but not AS good as the 0W40.
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Old 09-05-2019, 10:53 AM   #363
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ahhh I checked the manual.. It has to meet one or the other, not both.

So technically should be fine with either the Castrol Edge 0w or the T6 5w-40.

Edit- what about this Castrol EDGE? This meets API SN, ILSAC GF-5, ACEA A1/B1, A5/B5,

https://www.amazon.com/Castrol-03084...gateway&sr=8-4
It is not the OE spec

The 5w-40 is stupid expensive. I'd rather run the 0w-40 at half the price lol.
I checked and I can get RMV for like 28$ at walmart shipped. I think the 0w-40 Castrol would be a better oil, however IF THE WORST case scenario did happen, I guess would be denied for warranty?

I never really use my dealer for anything lol... Do all the maintenance myself, so I'm not really building any relationships here.

Last edited by vlad11591; 09-05-2019 at 12:47 PM.
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Old 09-05-2019, 04:50 PM   #364
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Ok so literally spent the whole work day researching..... Note for EJ

GF-5 = not good because its resource conserving and will likely shear to 20 grade.

I don't drive the car under harsh conditions, but I do spirited driving on the weekends if I can get out.

I'm thinking if I want to be anal about warranty protection-
Motul 8100 X-Clean EFE
Rotella t6 MV

if not.. then I can just run 0w-40 Castrol Edge and call it a day. Meets a slew of specs, including Porsche.

Thoughts?
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Old 09-06-2019, 08:57 AM   #365
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I run Edge 0W-40 so that’s my pick. It meets the toughest specs in the industry and is cheap. Although X-clean and RT6 MV are both solid choices.
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Old 09-07-2019, 05:24 AM   #366
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I use Rotella t4 15- 40, this was recommended by my mechanic that's been build subaru for good almost 20 years. Thoughts on how itd affects my engine good or bad for it?
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Old 09-07-2019, 05:26 AM   #367
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I drive a 99 forester 2.5 na 176k on it.
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Old 09-09-2019, 01:28 PM   #368
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Quote:
Originally Posted by Wrayes9899 View Post
I use Rotella t4 15- 40, this was recommended by my mechanic that's been build subaru for good almost 20 years. Thoughts on how itd affects my engine good or bad for it?
Quote:
Originally Posted by Wrayes9899 View Post
I drive a 99 forester 2.5 na 176k on it.
I've never seen an n/a Forester than needed 15W40 and n/a Subaru's generally do not need anything thicker than 10W-30. I used 10W40 in a '99 Outback to try to quieten piston slap (didn't help), but n/a EJ's have been shown to go over 7,500 miles on conventional 5W-30 with no problems.
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Old 09-17-2019, 12:38 AM   #369
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Originally Posted by gpshumway View Post
1. Introduction

Standard Disclaimer:
This guide is not an official Subaru document, and does not represent direct technical advice from the author, it is opinion and for information only. If you have an engine failure after reading this, don't blame me or anyone else at NASIOC.

TL;DR Readers:
Readers with A.D.D. are advised to skip to the engine specific recommendations and specific oils sections at the end of this guide, but be warned, forum members and moderators will not treat kindly new threads asking questions which are answered here.

Ron (Unabomber) has done a wonderful job with all of his FAQs including the one on oil. Despite Ron’s best efforts we continue to see frequent “best oil” and “how good is this oil?” threads. With the advent of the FA and FB series of engines from Subaru and their substantially different design from the older EJ engines, it seems time to provide some updated information and a basis for oil selection in different applications and driving conditions. In his FAQ Ron offers his opinion as to which oils are “best” if you were to press him on the subject. While there are very good reasons for his selections, Ron did not enumerate them in his FAQ. This guide is not intended to supplant Ron’s information, but augment it by providing a detailed discussion of motor oil and its properties. It is the intent of this guide to provide the background information required for a reasonably competent layperson to select a “good” oil for their application. This process consists mostly of understanding what categories exist for motor oil and selecting an oil from the right category, the performance differences between oils in the same category are generally so small as to be immeasurable outside a laboratory. Because of this it is impossible for laypersons to determine which oil is “best”. Even professionals with the tools and knowledge to do such analysis generally don't have the time or resources. If you take nothing else from this guide, it should be to stop focusing on brand and “best” so you can think more about category and “good”.

This guide is a combination of information gleaned from various internet sources, industry organizations and companies involved with making and testing motor oil. I am not a lubrication engineer or tribologist, merely a technically savvy enthusiast. Much of this guide consists of my opinion which is based upon the imperfect information available to the general public. As such, reasonable people will undoubtedly disagree with my assessments. That’s fine, I’m certainly willing to learn from others and hopefully fill some of the large void of information surrounding motor oil. Your comments are welcome and appreciated, but please keep it civil and remember that much of the available information is imperfect at best. Please feel free to point out any inaccuracies or glaring omissions.

We will start by discussing the basics of engine lubrication and the physical properties of motor oil, move to the specifications which control those properties and define the categories modern oils fit into. We'll briefly discuss used oil analysis as a tool for confirming and fine tuning a selection, and finally we'll examine what Subaru recommends for their cars and use all that information to select the correct category of oil for our unique situation. This guide will generally illustrate how to select oils based upon technical requirements, and will only obliquely address concerns over warranty coverage. Subaru's recommendations for oil will be the starting point for selection, but some reading between the lines of the simplistically written owner's manuals will be required. For most users technical and warranty requirements coincide nicely, but for many owners of performance Subarus there is some cause for concern. We will address these concerns in a specific section on warranty requirements.
Thank you for the info
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Old 10-01-2019, 03:35 PM   #370
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Been away from Subaru for a while, but I had to chime in.

I was running Mobil1 15w50 and Redline 10w40 on the factory motor for nearly 2 years. This is in California, but that was all year round. Mornings were low 40s or high 30s in the winter.

I chose to get a built motor and make more power with some margin of safety.
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Old 10-21-2019, 05:43 PM   #371
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I ultimately went with 0w-40 Edge. It worked so well on the DIT, and I think it will work fine for the EJ. IT's super cheap on amazon right now at 22$/5 qt jug.
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Old 10-21-2019, 11:32 PM   #372
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If there is an award for this write, you certainly deserve it. my gosh, thats some serious data.
I read and tried the various oils that sounded good for my 08-14 wrx EJ turbo. and had great results with RotellaT6 and my other favorite Motul x-clean.

Why no mention of Liqui Moly?
My mechanic who does primarily Subies, recommends it.
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Old 10-23-2019, 09:06 AM   #373
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Default The NASIOC Oil Selection Guide

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Originally Posted by Speed Assault View Post
Why no mention of Liqui Moly?

My mechanic who does primarily Subies, recommends it.
It’s good oil and not sure why it doesn’t get mentioned much around here. Probably because you can get 5 quarts of an oil that meets the same specs from Wal-Mart or Amazon for $25-$30. Bigger following among German car enthusiasts though.

Is LiquiMoly overrated?
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Old 11-10-2019, 08:00 PM   #374
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2007 wrx TBE with high flow cat, intake and custom tune. No racing

Experience with the pp euro 5w40? The Rotella t6 mv seems intriguing as well. Thanks
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