('14+) Which motor oil do you use? - Subaru Forester Owners Forum
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post #1 of 85 (permalink) Old 01-07-2017, 11:11 PM Thread Starter
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Which motor oil do you use?

I used to be a Mobil 1 diehard fan. But these days, I have a new philosophy, based on my Toyota cars: do what the manufacturer says. As for Subaru and oil changes, it says to take it to the dealer and let them replace the oil with 0W-20 synthetic. Ok fine. Also, I have 2 years free maintenance. But, what oil do you guys use? Is it OK to use Mobil 1? Am I a fool for paying money for oil when the dealer will do it for free? Thanks for any advice!

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post #2 of 85 (permalink) Old 01-08-2017, 12:15 AM
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I plan to do my own oil changes even though I have free lifeyime oil changes from my dealer. It isn't worth the hassel of driving to the dealer and waiting for them to change the oil.

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post #3 of 85 (permalink) Old 01-08-2017, 12:39 AM
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Hello,

if you do oil-change by our own take 5W30 - and then change all 10000mls.

Subaru must take 0w20 by law because of fuel consumtion.

......but there are a lot of troubles with 0w20 and the FB-Engine!

Martin

.....sorry for my bad english, i'm from germany
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post #4 of 85 (permalink) Old 01-08-2017, 01:55 AM
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Uh, we don't have that law.
MY2010 2.5x...... and I'm using Mobil 5000 5W30
Change every 5,000 miles.
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post #5 of 85 (permalink) Old 01-08-2017, 02:25 AM
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Hello,

i think you have a EJ-Engine - totally different to FB-Engine!

For the EJ-Engine i allways used 5W40, because with the 5W30 a allways had noise after 12000Km.

One time i drove 25000Km with 5W40 without any noise - was a SGS 2.0 AT Forester.

For the early FB-Engine i would use 5W30 an for the newer 0W30 because they changed the Pistonrings.

......but not a 0W20!


Martin

.....sorry for my bad english, i'm from germany
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post #6 of 85 (permalink) Old 01-08-2017, 02:32 AM
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Hello,

i forgot:

By law in USA Subaru have to fill in 0W20 Oil in the FB-Engines.

And the reason is Fuel-consumtion.

If they did not they had to pay 5,50$ per sold Car - that's a lot guys, when you sell 500000 cars a year!

Martin

.....sorry for my bad english, i'm from germany
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post #7 of 85 (permalink) Old 01-08-2017, 03:23 AM
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Quote:
Originally Posted by Figure_of_Disguise View Post
... By law in USA Subaru have to fill in 0W20 Oil in the FB-Engines. And the reason is Fuel-consumtion. If they did not they had to pay 5,50$ per sold Car...
I doubt if all of that is correct. It is true that Subaru specifies 0W-20 oil to achieve better fuel consumption. And Subaru may require its dealers to only install Subaru oil of the recommended viscosity.
I have not heard of the $5.50 oil fine.
And there is no law against an owner using whatever oil they want in their Subaru.
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post #8 of 85 (permalink) Old 01-08-2017, 04:28 AM
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Originally Posted by vintage42 View Post
I doubt if all of that is correct. It is true that Subaru specifies 0W-20 oil to achieve better fuel consumption. And Subaru may require its dealers to only install Subaru oil of the recommended viscosity.
When Subaru vehicles are certified for mileage, they probably used 0w-20. A consumer should try it as well. If it works, why change to something else?

If your vehicle, with 0w-20 installed, is using oil, then consider switching to something slightly heavier - 5w-30. Or try a different brand of 0w-20. I like and use Mobil 1 (5w-30) but I think it thins out during the oil change interval. Or try 0w-20 with an additive like MoS2.

If you look in your manual, Subaru gives you some oil options. But start by trying 0w-20 and see if your engine is sucking oil. If it ain't broke, don't fix it.
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post #9 of 85 (permalink) Old 01-08-2017, 04:57 AM
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In the US, the Magnuson–Moss Warranty Act allows you to use whatever brand of oil you want. However, you need to use an oil that fits within the guidelines of the manufactures requirement if you expect the warranty agreement to remain effective., which most major oil brands do.... All you need to do is read the manual, then see if the oil itself fits within the guidelines, pretty simple.

If Subaru were to say you MUST use their branded oil, they have to supply it. They can recommend a certain brand. Some dealers will try to avoid this 1975 legislation language.

Having written warranty claims for nearly 30 years I'm very familiar with how this works.

I use Mobil One at times, big user of Pennzoil Platinum and some Quaker State full synthetic. I always use the weight specified while under warranty. Once the warranty is over, I do at times stray a bit depending on the time of year.

You will get 20 opinions if asking 20 people. I'm simply posting what the law and what warranty agreements allow.

Remember, a warranty is an agreement. You step out side of those parameters, the manufacture can say no warranty. Yet people do it all the time. Usually they'll get away with it. But I've seen some that haven't. Then they whine about the piece of junk they bought, which is total nonsense.

Put yourself in their position. Let's say you have the knowledge or think you do to make a product. You or your engineers suggest certain things need to be done for a warranty agreement. If someone went out of those parameters, would you pay for a failure? I know what that answer is even if they won't admit it.

Like the guy that recently posted about an engine failure at 45K miles but changed oil every 15K. GEZ.

Facts are facts.
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post #10 of 85 (permalink) Old 01-08-2017, 05:39 AM
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I used Pennzoil Platinum in my Forester and use Castrol Edge full synthetic in the STI, you want a euro spec oil. I would not personally run Mobile 1 in anything other than domestic cars/ trucks....

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post #11 of 85 (permalink) Old 01-08-2017, 05:53 AM
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Which motor oil do you use?

Pennzoil Platinum Ultra 0/20 every 5k.

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Last edited by DockingPilot; 01-08-2017 at 06:04 AM.
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post #12 of 85 (permalink) Old 01-08-2017, 07:08 AM
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Quote:
Originally Posted by ScoobySnaXT View Post
... you want a euro spec oil. I would not personally run Mobile 1 in anything other than domestic cars/ trucks...
I use Mobil 1 European Car Formula, $26 for a jug at Walmart.
https://www.mobil.com/English-US/Pas...bil-1-FS-0W-40
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post #13 of 85 (permalink) Old 01-08-2017, 08:50 AM
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Hello,

funny that you guys don't know about that problem!

Hyundai & Kai had to pay 100.000.000USD in 2012 because they made wrong fuel-labels.

.....the ETA checks some cars every year.

On teststands subaru used 0W20 oil to get the Fuelconsumtion tested.
(better on coldstart and faster at 65°C operatin temperature - 5W30 needs 80°C).

So if Subaru fill in a new car tey want to sell a 5W30 oil the car takes 1,5l/100Km more - then the toubles beginn!

In Europe there ist only 5W30 in Subaru garages also for the Diesel - the original Subaru-oil ist special and made by Motul.

...look at the 0.48% Ash - normal Oil has 0.80%

When the coustemer has payed his car - he can fill in what he wants, that's an other story!

.....hm - not easy to explain in a foreign language!

Martin
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File Type: pdf Subaru By Motul 5W-30 (GB).pdf (23.9 KB, 239 views)

.....sorry for my bad english, i'm from germany
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post #14 of 85 (permalink) Old 01-08-2017, 08:56 AM
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Hello,

sorry, pressed the wrong button.

In US manual the 0W20 ist "required" no other Oil ist recommended!

In Europe the 0w30 ist "recommended" but you can also use the 5W30.

......that's a big difference!

Martin
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.....sorry for my bad english, i'm from germany
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post #15 of 85 (permalink) Old 01-08-2017, 12:02 PM
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I like Penzoil Ultra Platinum for the winter and Motul for the summer. That is for the 2011 Impreza which takes 5w30 and 2011 Forester which takes 0w20.


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