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2018 Subaru WRX - Oil #4866085 09/11/18 12:56 PM
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David2468 Offline OP
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Hi folks,

New to the forum, but have read many of the posts over the years. Great information...Thanks all!!

I've been using Castrol Syntec (now edge) for several years on my vehicles (Rav4 V6, VW 1.8T), but have now acquired a Subaru WRX and have been reading a bit, perhaps over reading, and over thinking which engine oil to use. According to spec. it states 5W30 with API-SN, or ILSAC GL4/5 or better. There are several "performance" oils on the market (Motul, Royal Purple, Total etc..) and even the Syntec from Canadian Tire is rated SN as well as Pennzoil, Mobil 1 etc.

Question is, which one is "better" to handle the extreme temperatures of the Subaru Turbo, and the lovely Toronto weather yet to come. Thoughts?

Thanks folks,

Re: 2018 Subaru WRX - Oil [Re: David2468] #4866095 09/11/18 01:14 PM
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Rolla07 Offline
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I was going to say Rotella T6 5w40, but since its new and under warranty, why not go with a 5w30 meeting D1G2, at least until SN+ oil comes available. Thats what Id do. Welcome to BITOG by the way!


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967
2015 Toyota Venza Parisian Blue Pearl 25k miles
TGMO 0W20 & OEM filter

Re: 2018 Subaru WRX - Oil [Re: David2468] #4866112 09/11/18 01:37 PM
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Needleman Offline
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I would use a full synthetic, 5W-30 API SN+, D1G2 in your favorite brand. A full synth should give better cold start flow versus non synthetic 5W-30 since you're up there in the GWN.


2014 Subaru Legacy 2.5 56k -- Subaru 0W-20/Subaru OEM filter
Re: 2018 Subaru WRX - Oil [Re: David2468] #4866117 09/11/18 01:41 PM
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CT8 Offline
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What does the owners manual suggest ? Go from there.


2015 F150 2.7
2018 F350 6.2
Re: 2018 Subaru WRX - Oil [Re: David2468] #4866136 09/11/18 02:11 PM
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PimTac Offline
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Owners manual. Pick your favorite brand with a SN+, d1G2 certification and go.


2017 Mazda CX5
Mobil 1 Annual Protection 0w20
Roki OEM filter.
Re: 2018 Subaru WRX - Oil [Re: David2468] #4866139 09/11/18 02:13 PM
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avi1777 Offline
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motul300v is one of the best but not with cats to much zinc

Re: 2018 Subaru WRX - Oil [Re: David2468] #4866151 09/11/18 02:34 PM
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dlundblad Offline
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There's also Rotella T6 Multi Vehicle if you can find it.

A "normal" synthetic worth looking at is Castrol Magnatec. Last I looked, it was $18 something a jug on Walmart.com.


03 Jeep WJ 4.0 208k
02 Volvo S60 2.4T 199k
97 Chevy Blazer 4.3 175k
04 Audi A4 3.0 210k

Re: 2018 Subaru WRX - Oil [Re: David2468] #4866244 09/11/18 04:41 PM
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Oildudeny Offline
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read your manual

Re: 2018 Subaru WRX - Oil [Re: Oildudeny] #4866253 09/11/18 04:46 PM
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Patman Offline
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Originally Posted by Oildudeny
read your manual


Guys, stop telling him to read his manual, he already has as he states in his original post what the oil requirements are from his manual so he's obviously read it already. So now he's asking for which brands that other people would recommend for him to handle both the heat of the turbo and a Toronto winter. I personally would recommend either Mobil 1 5w30 or Pennzoil Platinum 5w30, whichever happens to be on sale at Canadian Tire at oil change time smile


2018 Corvette, 20k, M1 ESP Formula 5w30 & NAPA Gold
2006 Civic EX Coupe, 156k, PUP 5w20 & Fram Ultra
2010 BMW 328i X-Drive,130k, GC 0w40 & Fram Ultra

Re: 2018 Subaru WRX - Oil [Re: David2468] #4866267 09/11/18 05:01 PM
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Razorsharpe Offline
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I have a 2015 WRX that has a stock engine, but I do track events and autocross. I ran 5W-30 synthetic for the first two oci's, but then switched to 0W40/5W40 because I was getting oil temps close to 250F on track in Texas summers. I use German Castrol 0W40 or Shell Rotella 5W40.

If you don't track your WRX, I would use a quality synthetic 5W30 or 0W30 given your cold winters and follow the severe service schedule. These are good cars and I have not had any issues or had any warranty needs in 25k miles.


2015 Subaru WRX, 35K, AMSOIL Signature Series 0W-40
2002 Honda S2000, 49K, Redline 10W-30
2015 Mazda 6, 72K, Castrol Syntec Hi-Mileage 5W-30
2008 Subaru Forester XT, 179K, Castrol Edge 0W-40 A3/B4
Re: 2018 Subaru WRX - Oil [Re: dlundblad] #4866274 09/11/18 05:04 PM
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bluesubie Offline
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Originally Posted by dlundblad
There's also Rotella T6 Multi Vehicle if you can find it.

A "normal" synthetic worth looking at is Castrol Magnatec. Last I looked, it was $18 something a jug on Walmart.com.

approved

Many WRX owners are running SN 5W-30’s, but foregoing the GF5 recommendation for higher HTHS oils like Rotella Multi Vehicle and ACEA C3 oils like Motul X-clean and Mobil 1 5W-30 ESP.

Some dealerships, especially in Canada, offer Motul X-clean as their premium oil. With a DIT, the oil gets contaminated with fuel pretty quickly becoming a 20 grade oil. That said, uoa’s on 100% stock DIT WRX’s running regular GF5 oils seem to show normal uoa wear numbers despite being a 20 grade. Seach the Service and Maintenance Forum (using google) for the 2015+ WRX uoa thread.

Remember, even a reflash is a modification so don’t stick with a GF5 oil if you intend to modify. Probaly a good idea for the track too.

And
welcome
cheers

Last edited by bluesubie; 09/11/18 05:08 PM.

'20 Subaru Outback Onyx XT | Idemitsu Zepro 0W-20
'04 Subaru Forester 2.5XT | Castrol Edge 0W-40
Re: 2018 Subaru WRX - Oil [Re: dlundblad] #4866283 09/11/18 05:20 PM
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Garak Offline
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Originally Posted by dlundblad
There's also Rotella T6 Multi Vehicle if you can find it.

Given the manual wording where it appears ILSAC is optional, I'd agree with that recommendation. The HTHS will be elevated while maintaining the correct SAE grade, with a phosphorus level that isn't overboard, for those that worry about that.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: 2018 Subaru WRX - Oil [Re: Garak] #4866306 09/11/18 05:51 PM
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oil_film_movies Offline
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Originally Posted by Patman
..... handle both the heat of the turbo and a Toronto winter. I personally would recommend either Mobil 1 5w30 or Pennzoil Platinum 5w30, whichever happens to be on sale at Canadian Tire at oil change time smile
That would work, but I think I'd use Mobil1 AFE 0w30 during the winter, and Mobil1 0w40 new-Corvette oil (the dexos2 ESP stuff, not the euro one) in the summer for this WRX beast. Seasonal change, 6 months at a time.
Originally Posted by Garak
Originally Posted by dlundblad
There's also Rotella T6 Multi Vehicle if you can find it.

Given the manual wording where it appears ILSAC is optional, I'd agree with that recommendation. The HTHS will be elevated while maintaining the correct SAE grade, with a phosphorus level that isn't overboard, for those that worry about that.
Rotella T6 Multi-vehicle 5w30 also has low calcium, which should keep LSPI away too. Good choice there. I'd still go with my seasonal 0w30/0w40 here though, even if the Subaru Owner's Manual is not sophisticated enough to cover that nice set of options that would satisfy the HTHS hot requirements with better Canada-cold flow!

Last edited by oil_film_movies; 09/11/18 05:53 PM.
Re: 2018 Subaru WRX - Oil [Re: David2468] #4866315 09/11/18 06:04 PM
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MRC01 Offline
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When people say "read the manual" they are not necessarily being flippant, but may be saying it doesn't matter as long as the oil meets the specs. As the OP suggests, he may be over-thinking this. It's hard to find UOAs or other hard evidence to support the notion that different brands, or "high performance" oils, or synthetics vs. conventional, makes any practical difference in engine wear or longevity, so long as each oil is used in-spec.

That said, all else equal, a narrower vis range is likely to be more shear stable: 5w20 over 0w20, 10w30 over 5w30 etc. Of course all else is not always equal. Synthetic base stocks have a flatter viscosity/temp curve so a synthetic 0w30 may be more shear stable than a conventional 10w30. It will definitely flow better on cold starts. But if the engine allows conventional oils, the engineers think it can withstand the temperature extremes. You may have to change it more often, but it's cheaper.

Re: 2018 Subaru WRX - Oil [Re: Razorsharpe] #4866316 09/11/18 06:05 PM
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kr_bitog Offline
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So what is oil tempeeatue difference after you change the oil weight from 30-weight to 40-weight/50-weight?

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