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#4808558 - 07/08/18 06:12 PM What oil should I use - Subaru Legacy 2018
reminiscence Offline


Registered: 06/10/18
Posts: 1
Loc: Eastern N.A.
Hi gang,

Looking for your input regarding the following vehicle. It was purchased new about a month ago, so I'm starting to think about my oil change game plan.

The basics:
  • 2018 Subaru Legacy 3.6R - 6 cyl
  • Owner's manual recommends 5w30 conventional oil, at 6,000 mile/6 month intervals.
  • API classification SN "resource conserving" or ILSAC GF-5 certified.
  • I live in a very cold part of the continent. The winters get very frigid at times, we're pretty much guaranteed to hit -20 degree weather at least a few times in the season.
  • The car does an 15 mile (one way) commute every work day. 10 miles of that is easy highway cruising. But I make sure to exercise my 6 cyl boxer with some hard accelerating once in a while... it would be unfair to the car otherwise smile
  • Car is brand new, and I made sure to baby the engine on its first 1000 mile break-in. Engine is purring along very nicely so far.



So based on my early limited knowledge of PCMO's, this is what I am considering. I am looking for any input to confirm if my line of thinking is correct, or if people would do things differently.
  • Based on my shorter than average commute, it's looking like I'll have to change the oil twice a year if I'm going to stick with conventional. But perhaps, after the warranty runs out I am wondering if there are any ill effects to changing it only when that 6,000 mile counter expires? What is the detriment to leaving the oil in the car for, say, 9 months instead of the recommended 6? Perhaps this duration will be longer if I opt for extended OCIs with a synthetic oil.
  • I'm scratching my head over the "...however 5w30 synthetic may be used for optimum engine performance" blurb on the owner's manual. (image above.) I am wondering exactly what "optimum engine performance" entails?
  • I hear that a synthetic 5w30 has better cold engine performance compared to a conventional 5w30, because the oil covers all of the moving parts in the engine quicker, immediately following starting of the engine. Is this true? If yes, how much of a difference does it make? As an example, if conventional 5w30 is going to allow the engine to last for the normal 200,000 miles or so even with the -20 winters then I'm not too concerned about spending more for synthetic just for the extra protection.
  • If I do decide to go for a synthetic oil, what OCI do you guys think I can safely work with? (after the vehicle warranty expires, of course)
  • Finally- is there any detriment in doing my first oil change before the 6 month/6000 mile mark? I heard that some new cars come with a special oil used for engine break-in (?)

Thanks in advance to the community for helping me keep my baby in tip top shape smile

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#4808569 - 07/08/18 06:30 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
Gixxer46 Offline


Registered: 06/06/18
Posts: 35
Loc: Canada
I would put any 0w30 oil you can get on sale. They all seem to be pretty decent. The 0 WILL BE GREAT FOR COLD WEATHER.Make sure the oil you buy has those labels.

After warranty, I would go 0W20 EXTENDED performance oils. You would have to do some UOA to figure out how long it would last. My last OIL CHANGE WAS 13,000 KM and lasted a year and a half. The analysis revealed the oil was still good and to retest in a couple thousand miles. I just changed it for the heck of it.

I would guess optimum performance would be max HP/torque, reliability, etc. Basically saying, we designed it to run on this oil and if you run something else we can't guarantee it will work as well.

Based on your mileage you could probably do them once a year.

My apologies for the caps, keyboard was possessed.

Congrats on the new purchase and enjoy the beautiful vehicle!


Edited by Gixxer46 (07/08/18 06:31 PM)
_________________________
2013 Ram 1500 with a 4.7.

I use 0W-20 year round. I alternate between RP and Amsoil Signature series.

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#4808574 - 07/08/18 06:40 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
123Saab Offline


Registered: 10/27/10
Posts: 1688
Loc: PA
Any 5w30 that meets the spec will be fine. I would not run 0w20 in that engine.

Castrol or Valvoline would be my personal choices, or maybe the new Rotella T6 5w30 multi vehicle.


Edited by 123Saab (07/08/18 06:40 PM)
_________________________
Anything can happen
The tallest towers be overturned
Those in high places be daunted
Those overlooked regarded
- Seamus Heaney

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#4808585 - 07/08/18 07:04 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
555 Offline


Registered: 06/08/09
Posts: 384
Loc: New England
welcome
Synthetic 5w-30 that meets spec.
I would check the Sube forum boards about a special factory fill. Can't say that's a reliable source but what are your research options?
If it was my car I would change the factory fill at 5,000 miles. I have no data backed reason for this. Just what I would do.




Edited by 555 (07/08/18 07:13 PM)
_________________________
84 XJ6 M1
92 Mustang 5.0 Redline
99 Tahoe 2 door Castrol Edge
99 MX5 Miata Anniversary Edition M1
04 Subaru STi Motul

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#4808586 - 07/08/18 07:05 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
PimTac Offline


Registered: 03/04/17
Posts: 4584
Loc: Soviet State of Washington
If that is the Subaru engine with the long and convoluted timing chain then I would recommend a major brand of synthetic that meets the owners manual recommendations. 5w30 or 0w30 would run well in that engine. The brand choice would be up to you.
_________________________
2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
Mobil 1 M108A EP filter


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#4808604 - 07/08/18 07:31 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1232
Loc: Winchester, Indiana
I will stick with a great oil choice for my recommendation, PP 5W30. Completely ignore the comment to run 0W20, you'd be a fool to run a 20 weight oil in any EJ/EZ engine. 3.6s are pretty easy on oil, and yes, you could make it to 200k easily on today's conventional 5W30s @ 6k intervals. It's your call, but for my money and SOPUS rebates, I'd stock up on the PP while it's on sale and use that.

Nice car, enjoy it!

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#4808613 - 07/08/18 07:44 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
mx5miata Offline


Registered: 03/28/10
Posts: 547
Loc: NY
5w30 synthetic all year long
_________________________
NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter

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#4808616 - 07/08/18 07:48 PM Re: What oil should I use - Subaru Legacy 2018 [Re: mx5miata]
TheLawnRanger Offline


Registered: 03/18/18
Posts: 494
Loc: Mississippi
Originally Posted By: mx5miata
5w30 synthetic all year long


+1
_________________________
'99 Cavalier 5w 30 SuperTech conventional
'11 Impala 5w 30 Magnatec full synthetic
'12 Colorado 5w 30 Magnatec full synthetic
*regular Wix oil filters for all

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#4808621 - 07/08/18 07:52 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
sopususer Offline


Registered: 03/17/11
Posts: 533
Loc: High Country of Western NC
1. Yes I would do synthetic since you are in a colder climate.

2. I'd stick with 5W-30 during warranty, but the 0W-30 advice above is not bad.

3. Pick any major brand, or your favorite color of bottle of any major and you can certainly sleep well.

Long time Subaru owner here. Always owned the 4 not the 6, but they are great cars. I'm assuming winter driving is on your agenda. You made an EXCELLENT choice.
_________________________
2017 Subaru Impreza 2.0
QSUD 0W-20/Wix 57055
2017 GMC Sierra Denali 5.3
QSUD 0W-20/NAPA Gold 100255
2017 Subaru Forester 2.5
QSUD 0W-20/Wix 57055

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#4808657 - 07/08/18 08:33 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
Danno Online   content


Registered: 10/07/12
Posts: 2021
Loc: Northern Ontario, Canada
If it was my car, PP 5W-30 and OEM filter, every 6k miles or 6 months as per manual.
Do use some moderate engine braking after 1,000 miles to help seat the rings.
_________________________
2016 Sorento SX V6 AWD
2015 KIA RIO SX
2010 Mazda 3 2.0L
2009 Venza V6 AWD
2013 Sonata 2.4L RIP in write-off crash

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#4808660 - 07/08/18 08:40 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
NormanBuntz Offline


Registered: 07/27/13
Posts: 2163
Loc: Outer Banks, NC
Former 2015 Outback owner here. To keep the Subaru warranty people from getting twisted in the unlikely event you had an engine problem, I'd leave the factory fill in for 5K miles. Then I'd change to any 5w-30 full synthetic that meets your API rating. I would do 6K mile intervals with a new filter regardless of time. Use Subaru filters if you choose, but there's lots of quality filter choices for a 6K mile interval.

Welcome to the forum.
_________________________
2017 Honda Odyssey SE, 14K
2013 Honda Accord LX, 58K
2007 Honda Ridgeline RTS, 86K
2007 Infiniti M35, 105K

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#4808666 - 07/08/18 08:47 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
147_Grain Offline


Registered: 03/11/13
Posts: 1956
Loc: USA
5W-30 synthetic year around.

0W-30 synthetic in the winter.

I do this with excellent results for the past 5 years in my 2013 Subaru Outback with the same 3.6L as yours.

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#4808703 - 07/08/18 09:48 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
Triple_Se7en Offline


Registered: 12/04/04
Posts: 8913
Loc: 1/2 hr. north of Detroit
0W30 in coldest months
5W30 in warmest months
I would use OEM filter until the warranty expires.

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#4808713 - 07/08/18 10:11 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
Gixxer46 Offline


Registered: 06/06/18
Posts: 35
Loc: Canada
Sorry, meant 0w30 extended.
_________________________
2013 Ram 1500 with a 4.7.

I use 0W-20 year round. I alternate between RP and Amsoil Signature series.

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#4808721 - 07/08/18 10:25 PM Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence]
Brigadier Offline


Registered: 03/11/12
Posts: 541
Loc: WA
No 20 weights! Good grief.

I would use one of the thinner d1G2 oils like PP 5W-30.
_________________________
2017 Hyundai Santa Fe SE, 3.3L, AWD, QSUD 5w30, STP LL Filter, LubeGard, E-0 92 octane

https://www.pure-gas.org/ << Wake up your engine!!

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