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What oil should I use - Subaru Legacy 2018 #4808558
07/08/18 05:12 PM
07/08/18 05:12 PM
Joined: Jun 2018
Posts: 1
Eastern N.A.
reminiscence Offline OP
reminiscence  Offline OP

Joined: Jun 2018
Posts: 1
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

Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808569
07/08/18 05:30 PM
07/08/18 05:30 PM
Joined: Jun 2018
Posts: 83
Canada
Gixxer46 Offline
Gixxer46  Offline

Joined: Jun 2018
Posts: 83
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!

Last edited by Gixxer46; 07/08/18 05:31 PM.

2013 Ram 1500 with a 4.7.

I use 0W-20 year round. I alternate between RP and Amsoil Signature series.
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808574
07/08/18 05:40 PM
07/08/18 05:40 PM
Joined: Oct 2010
Posts: 1,754
PA
123Saab Offline
123Saab  Offline

Joined: Oct 2010
Posts: 1,754
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.

Last edited by 123Saab; 07/08/18 05:40 PM.

Anything can happen
The tallest towers be overturned
Those in high places be daunted
Those overlooked regarded
- Seamus Heaney
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808585
07/08/18 06:04 PM
07/08/18 06:04 PM
Joined: Jun 2009
Posts: 475
New England
555 Offline
555  Offline

Joined: Jun 2009
Posts: 475
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.



Last edited by 555; 07/08/18 06:13 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
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808586
07/08/18 06:05 PM
07/08/18 06:05 PM
Joined: Mar 2017
Posts: 7,595
...
PimTac Offline
PimTac  Offline

Joined: Mar 2017
Posts: 7,595
...
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.


Cannot see signatures any longer so it doesn’t matter.
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808604
07/08/18 06:31 PM
07/08/18 06:31 PM
Joined: May 2012
Posts: 2,278
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline

Joined: May 2012
Posts: 2,278
The land of USA-made Subies!
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!

Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808613
07/08/18 06:44 PM
07/08/18 06:44 PM
Joined: Mar 2010
Posts: 654
NY
mx5miata Offline
mx5miata  Offline

Joined: Mar 2010
Posts: 654
NY
5w30 synthetic all year long


NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter
Re: What oil should I use - Subaru Legacy 2018 [Re: mx5miata] #4808616
07/08/18 06:48 PM
07/08/18 06:48 PM
Joined: Mar 2018
Posts: 905
Mississippi
TheLawnRanger Offline
TheLawnRanger  Offline

Joined: Mar 2018
Posts: 905
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
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808621
07/08/18 06:52 PM
07/08/18 06:52 PM
Joined: Mar 2011
Posts: 580
High Country of Western NC
sopususer Offline
sopususer  Offline

Joined: Mar 2011
Posts: 580
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
PP 0W-20/NAPA Gold 7055
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808657
07/08/18 07:33 PM
07/08/18 07:33 PM
Joined: Oct 2012
Posts: 2,495
Northern Ontario, Canada
Danno Offline
Danno  Offline

Joined: Oct 2012
Posts: 2,495
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
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808660
07/08/18 07:40 PM
07/08/18 07:40 PM
Joined: Jul 2013
Posts: 2,390
OBX & Central FL
NormanBuntz Offline
NormanBuntz  Offline

Joined: Jul 2013
Posts: 2,390
OBX & Central FL
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, 18K
2013 Honda Accord LX, 59K
2007 Honda Ridgeline RTS, 89K
2007 Infiniti M35, 107K
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808666
07/08/18 07:47 PM
07/08/18 07:47 PM
Joined: Mar 2013
Posts: 1,991
USA
147_Grain Offline
147_Grain  Offline

Joined: Mar 2013
Posts: 1,991
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.

Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808703
07/08/18 08:48 PM
07/08/18 08:48 PM
Joined: Dec 2004
Posts: 10,059
1/2 hr N.E. of Detroit
Triple_Se7en Offline
Triple_Se7en  Offline

Joined: Dec 2004
Posts: 10,059
1/2 hr N.E. of Detroit
0W30 in coldest months
5W30 in warmest months
I would use OEM filter until the warranty expires.


2019 Hyundai SantaFe 2.4 factory fill / QS 5w20 conv. / Mahle OEM oil filter
04 Chev Colorado 3.5 QS / Valv syn 5w30 blend K&N filter
03 Chev Malibu 3.1 QS / Valv Syn 5w30 blend Fram EG filter
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808713
07/08/18 09:11 PM
07/08/18 09:11 PM
Joined: Jun 2018
Posts: 83
Canada
Gixxer46 Offline
Gixxer46  Offline

Joined: Jun 2018
Posts: 83
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.
Re: What oil should I use - Subaru Legacy 2018 [Re: reminiscence] #4808721
07/08/18 09:25 PM
07/08/18 09:25 PM
Joined: Mar 2012
Posts: 1,025
WA
Brigadier Offline
Brigadier  Offline

Joined: Mar 2012
Posts: 1,025
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, OEM filter, Hy-per Lube ZRA

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

Where the stars and stripes and the eagle fly
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