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#4663248 - 02/11/18 06:06 PM Castrol 0W40
ssbtech Offline


Registered: 03/09/15
Posts: 1
Loc: Canada
My Subaru Outback Turbo has barely burned a drop of oil in its life, which is surprising considering they're somewhat known for it.

I've mostly only used the GC 0W30, but the 0w40 has caught my eye. Not sure why, but it has. The lower price is certainly attractive.

Question is - do I keep buying single jugs of the 0w30, or do I make the switch to the 0w40? I seem to recall that the 0w30 went through a change a couple of years ago? Might be wrong on that.

Any thoughts on the 0w40 in the Subie?

Thanks.

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#4663249 - 02/11/18 06:07 PM Re: Castrol 0W40 [Re: ssbtech]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4073
Loc: North Carolina
Switch. Lower cost, small bump in vis.

Very small though - they're basically the same oil.
_________________________
"Zed's dead baby, Zed's dead."

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#4663270 - 02/11/18 06:40 PM Re: Castrol 0W40 [Re: ssbtech]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1763
Loc: Alberta
40 is 10 more than 30. Itís like having an eleven on your amplifier. (From the movie This is Spinal Tap.) LOL.


Edited by Snagglefoot (02/11/18 06:41 PM)

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#4663291 - 02/11/18 07:22 PM Re: Castrol 0W40 [Re: Snagglefoot]
CT8 Offline


Registered: 10/09/14
Posts: 11009
Loc: Idaho
Originally Posted By: Snagglefoot
40 is 10 more than 30. Itís like having an eleven on your amplifier. (From the movie This is Spinal Tap.) LOL.
11 is better.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#4663294 - 02/11/18 07:27 PM Re: Castrol 0W40 [Re: ssbtech]
double vanos Offline


Registered: 08/05/04
Posts: 1887
Loc: 5600 feet elevation, Arizona
Go for it! Using it in my f150 Ecoboost for 70k miles, no problems at all . Stout oil.
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Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...

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#4663297 - 02/11/18 07:30 PM Re: Castrol 0W40 [Re: ssbtech]
Trav Offline


Registered: 11/20/06
Posts: 18900
Loc: MA, Mittelfranken.de
+1 0w40
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ASE L1, Master. Deutsch Meisterbrief.

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#4663394 - 02/11/18 09:39 PM Re: Castrol 0W40 [Re: Trav]
Kira Offline


Registered: 08/19/10
Posts: 5257
Loc: Champlain/Hudson Valley
+2 0w40, +1 11

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#4663554 - 02/12/18 07:19 AM Re: Castrol 0W40 [Re: ssbtech]
BufordTJustice Offline


Registered: 11/17/16
Posts: 69
Loc: Middle Florida
My 2011 Outback 3.6R (just about to turn 120K) had its first OCI with M1 0w-40 and it was notably smoother than any 5w-30 tried before it (PUP, Cast Magnatec, PP, M1, M1 HM). Currently on a run of Pen Plat Euro 0w-40 and it has gotten smoother still. These two and the Castrol 0w-40 are not heavy 40 weight oils....all have 3.8 or under HTHS. Pennzoil and M1 quickly move into the low-3 HTHS arena (as in within the OCI). That's heavy 30 weight territory.

With the noted benefit in smoothness, an MPG penalty that is so low its within the statistical noise of my ability to calculate it, I'm really pleased and will continue using it. The M1 0w-40 had a few 27-28 degree cold starts (cold for Florida) and it behaved just like all the other syn 5w-30 oils I've run.

I think you're just fine.
_________________________
1999 Porsche 911 Cab 3.4 6-speed -> Mobil Delvac-1 5w-40 ESP (CJ4) -> Fram Ultra XG3675

2011 Subaru Outback 3.6R -> M1 0w-40 FS -> Fram Ultra XG3593A

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#4663575 - 02/12/18 07:43 AM Re: Castrol 0W40 [Re: ssbtech]
bluesubie Offline


Registered: 08/04/03
Posts: 2280
Loc: NJ
Originally Posted By: ssbtech

Any thoughts on the 0w40 in the Subie?

That's what I'm running at the moment.
_________________________
'04 Subaru Forester 2.5XT
Castrol Edge 0W-40

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#4663686 - 02/12/18 09:42 AM Re: Castrol 0W40 [Re: Kira]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: Kira
+2 0w40, +1 11


+ eleventy
_________________________
Mighty Mouse Tech
Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL

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#4663696 - 02/12/18 09:50 AM Re: Castrol 0W40 [Re: ssbtech]
SubieRubyRoo Online   content


Registered: 05/14/12
Posts: 1139
Loc: Winchester, Indiana
I'd run the PP Euro 0W40. A couple bucks cheaper than the Castrol, and just as good. Had crazy high TBN retention in my Odyssey, an engine known to quickly kill oils due to iVCM and fuel dilution.

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#4664287 - 02/12/18 08:09 PM Re: Castrol 0W40 [Re: ssbtech]
jongies3 Offline


Registered: 03/11/16
Posts: 803
Loc: MT
My Tacoma seems to like the 0W-40 and it's a true synthetic. I can get 6 quarts for right around $32 at Walmart and it's convenient buying a 5qt jug and a single quart bottle over 6 individual quarts.

I don't think the viscosity is much different. GC 0W-30 was always considered a "thick" 30wt. Your turbo will probably like the 40wt a bit better too, I would imagine, especially if you're a spirited driver!
_________________________
2004 Toyota Tacoma 3.4 V6: Mobil 1 AFE 0W-30, FRAM TG-3600 filter
1996 Ford Contour 2.5 V6 QSGB 5W-30, MC FL-500S filter

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#4664642 - 02/13/18 09:32 AM Re: Castrol 0W40 [Re: ssbtech]
artificialist Offline


Registered: 09/23/07
Posts: 8598
Loc: Florida
Some people say that the Castrol 0w40 is just barely thick enough to be called an Xw40 and Castrol Euro 0w30 is just barely thin enough to be called a Xw30.

The oil analysis sections have articles on both oils.

From what I can see, replacing Castrol Euro 0w30 with Castrol 0W40 will not make a significant difference.

I use Castrol 0w40 in my Mitsu Lancer Ralliart and it doesn't seem to be a problem.
_________________________
2010 Lancer Ralliart Sportback

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#4664652 - 02/13/18 09:48 AM Re: Castrol 0W40 [Re: ssbtech]
Smoqueed Offline


Registered: 12/24/16
Posts: 92
Loc: Indiana, USA
The 0w40 is easier to source, atleast for me. I run Mobil 1 0w40 in my 97 firebid formula, she seems to like it. The LT1 engines seem to prefer a thick 30 or thin 40 weight oil from what I've read/experienced. I would use Castrol 0w40 if the Mobil wasn't in stock without issue.

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