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Old 06-09-2018, 09:42 AM   #1
Jerry_NJ
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Default 0W20 oil dealer service

I am scheduled for my second dealer oil/filter/tire-rotation and will ask what oil they are using... bet it is not synthetic even though the cost is an outrageous $90. I have changed my own oil for 50 years but decided to get the new Impreza serviced by the dealer for the first couple years.
1) I can consult owner manual, but ask is anyone using 0W20 full synthetic?
2) NJ is rather hot in the summer is the 20 weight sufficiently high viscosity?
3) Is there a reason to rotate the tires more than every 10,000 miles?

I estimate I can change my oil and filter, even with Mobile 1 full synthetic for under $30, a $60 savings for very little work... and no tire rotation. Then if I use a Castrol 5W30 regular oil I can trim a few dollars off the cost, but will the synthetic give better mileage, and if 0W20 even better mileage?

I drive mostly country roads, few stop lights and usually low traffic. I get about 34 mpg. I don't know what the 2017 Impreza will give me on the highway on long distance trips... hope closer to 40 mpg.
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Old 06-09-2018, 10:49 AM   #2
Charlie-III
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To me, car mfr's are running light oil for that fraction of a MPG they can get.
In NJ, I usually run 10w-30 year round. A 10w-40 on higher mileage engines in summer when I will be doing long highway runs or pulling 2000lb trailers.

On this forum, seems like too many peeps with engine issues running light Mobil1 (not "mobile"), I don't run Mobil1, especially a light weight.
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Old 06-09-2018, 12:32 PM   #3
Jerry_NJ
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Thanks for the info, I'll likely stay with 5W30 as I have used in the past, synthetic or not. Not sure the synthetic is worth the extra cost over premium oils, then I haven't checked to see the cost. We can get full synthetic for under $23 for 5 quarts at Walmart, including Mobil 1. Thanks too for the correction, it may not help between/among being old, some dyslexia, and touch typing I am capable of making the mistake again... then to I am a retired Electrical Engineer, always did better with numbers, notwithstanding my lake of understanding of 0W20. That just cam on my "radar screen". As noted, next change in oil is at the Dealer again, Monday. I'll ask what they use on a "regular" oil change. They charge enough for full synthetic.
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Old 06-09-2018, 03:55 PM   #4
Charlie-III
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Where in "NorthCentral NJ" are you?
I do my own repair work as well as work on contract with a local shop. I get my own, as well as some of theirs, Subaru work.....
They do most basics as well as tires.
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Old 06-09-2018, 06:37 PM   #5
Elbert Bass
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0W20 is ONLY available as a synthetic that I am aware of.
As far as using a heavier oil in Subaru engines spec'ed for 0W20:
Rings in these engines are nearly half the thickness of older rings and have very little tension to reduce friction. if you use a heavier oil Subaru tells techs the rings will float on the oil, pumping oil into the combustion chamber and burning.
This was proved with early FB20/FB25 engines that had oil consumption issues - ring tension was too loose and those engines burned oil.
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Old 06-09-2018, 07:29 PM   #6
Hondaslayer
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Quote:
Originally Posted by Jerry_NJ View Post
I am scheduled for my second dealer oil/filter/tire-rotation and will ask what oil they are using... bet it is not synthetic even though the cost is an outrageous $90. I have changed my own oil for 50 years but decided to get the new Impreza serviced by the dealer for the first couple years.
1) I can consult owner manual, but ask is anyone using 0W20 full synthetic?
2) NJ is rather hot in the summer is the 20 weight sufficiently high viscosity?
3) Is there a reason to rotate the tires more than every 10,000 miles?

I estimate I can change my oil and filter, even with Mobile 1 full synthetic for under $30, a $60 savings for very little work... and no tire rotation. Then if I use a Castrol 5W30 regular oil I can trim a few dollars off the cost, but will the synthetic give better mileage, and if 0W20 even better mileage?

I drive mostly country roads, few stop lights and usually low traffic. I get about 34 mpg. I don't know what the 2017 Impreza will give me on the highway on long distance trips... hope closer to 40 mpg.

Bet you are wrong.


Non-synthetic 0W20 supposedly exists, but I have never seen it.
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Old 06-09-2018, 11:00 PM   #7
Jerry_NJ
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Interesting, but not sure if we are converging on anything. I am okay if 0W20 is or isn't only synthetic. I do assume with it being lighter weight than anything I have ever used the extra viscosity strength/stability of synthetic would be a good investment if going to 0W20. As said, I will ask the dealer what they use on a "normal" oil/filter change on a 2017 Subaru. The dealer I purchased from and shop I will use is Flemington NJ. I'm sure they do not farm out the oil change, at the cost they charge it is a money maker and gives them work for mechanics in training... assuming there is such.
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Old 06-09-2018, 11:14 PM   #8
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Synthetic oil is required for all Subarus (excluding 6 cylinders) from 2015 and up (some models earlier). If your dealer is not using synthetic oil, then make sure you have it in writing because you will have issues later.

We have seen people running regular oil and the wrong weight oil come in with all kinds of issues, from drivability issues (hesitation, sluggish) to failures of components (oil control valves.)

If you dont want to spend money at the dealer, at least use what is required. Skimping on maintenance, especially on a new car, will only cause issues later and possible warranty claim denial.
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Old 06-10-2018, 07:42 AM   #9
Charlie-III
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Quote:
Originally Posted by Charlie-III View Post
To me, car mfr's are running light oil for that fraction of a MPG they can get.
In NJ, I usually run 10w-30 year round. A 10w-40 on higher mileage engines in summer when I will be doing long highway runs or pulling 2000lb trailers.

On this forum, seems like too many peeps with engine issues running light Mobil1 (not "mobile"), I don't run Mobil1, especially a light weight.
NOTE:this is for EJ engines and other brands, may not be valid for newer Subaru engines.
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Old 06-10-2018, 07:59 AM   #10
Jerry_NJ
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Thanks, I'm somewhat convinced full synthetic is worth the extra money. In fact after several years of regular oil I started using Shell full synthetic in my 2004 Forester which is the car I traded in (yes, it still had some trade in value at the dealer, it was low mileage, under 80,000 miles). I can, and surely will consult the owner manual, but to that I'll talk with the dealer shop folks on my oil change tomorrow. As for saving money, the service package includes rotating tires, which I think is totally unnecessary with the oil change frequency, about 5,000 miles. I'll ask what the cost is absent the tire rotation. Still, while I was moved to thinking, no more self oil changes, the light weight and size of the Impreza makes me think I may return to self maintenance at least on this item. My other vehicle, a 2016 Chevy Colorado pickup will continue to see oil changes at the dealer or independent. The truck is too big for me to feel comfortable putting in on my ramps, then too it may be high enough I don't need to elevate the front, but I digress. Thanks to all for the discussion.
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Old 06-11-2018, 12:25 AM   #11
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Subaru carries full synthetic 0w20 and 5w30, for warranty stuff it has to be idemitsu.

Ford offers a semi-synthetic 0w20 - I saw it Friday.

Turbo cars have the same cam timing systems, and run 5w30 synthetic without cam timing issues. I see no reason why non-turbos couldn't as well. In class, we were told the 0w20 was due to the way the cam timing worked - valve spring pressure against the cam lobes causes oil to either enter or exit chambers on the cam sprocket through a valve that opens at specific times. More likely the move is for EPA mandates.
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Old 06-11-2018, 01:14 PM   #12
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snythetic is for either long change intervals or to withstand the heat of turbos without coking, that's it.
If you are changing your oil at a reasonably interval and it's not a turbo it's a waste of money.

Like a couple people mentioned, the ultra light oils spec'd nowadays is for them to squeeze a little more mpg to meet the CAFE regs, which are a joke anyway and the program is a miserable failure but still. The light oil will not protect as well as heavier oil as it can't cling to parts as well.
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Old 06-11-2018, 03:44 PM   #13
Jerry_NJ
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Just back from the dealer, they use the Subaru 0W20 and that weight is what is called for on the oil filler cap. The recommended interval is 7,500 miles...so the full synthetic seems well in order. That's enough for a year of driving for me. I may continue to have the dealer change the oil and filter (and free car wash) and skip the tire rotation until every other time. That cuts the cost back to abut $70 rather than $90 (tax included). Given the small 2 liter engine has almost 5 quarts of capacity, it may have enough cooling to manage highway driving in the summer with the W20 weight upper spec. Then given the car will have about 15,000 miles when the next change comes up, a full synthetic 5W30 may be worth a try. The engine will have those miles with the lighter oil during its "break in".
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Old 06-13-2018, 12:29 PM   #14
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You sure about that service interval? I could have sworn back in 2014ish they dropped the schedule A to 6000 miles. Check your manual.

And that's if you don't drive in dusty, hot, humid, high speed, stop and go, hilly, or with frequent towing...
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Old 06-13-2018, 02:26 PM   #15
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I've been using 0W20 in my 2012 since I bought it. Mostly because it's the recommended weight in the owners manual. Other than some roads trips I live in the DC area and I think we have *slightly* warmer summers compared to NJ. Commuting in stop and go traffic on the beltway and I've never had an issue.
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Old 06-16-2018, 04:02 PM   #16
Msprain10
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I just had my oil changed at Subaru dealer. Receipt shows they used synthetic oil but my next change sticker was a 5000 mile interval. Manual states 7500 between changes. Maybe it's a money making scheme.
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Old 06-17-2018, 02:51 PM   #17
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I'll check the sticker to see what the dealer recommends, I may low mileage use on my Impreza and will do oil and filter only once a year even it it gets to 7000 miles. I'll likely change my oil next time myself and now plan to use the Mobil 1 0W20. I think the synthetic is so stable it can take the heat of summer with a W20 rating. The little girl Impreza gives me about 32 mpg in my rural environment which has few stop lights but also no 50 cruse runs like I'd get on the Interstate. I hope to get closer to 40 and may learn in the coming weeks as I keep thinking "time to visit" someone in North Carolina, about a 500 mile trip. In another tread asking about the drain plug crush washer replacement I got mixed answers and now answer on the size, welcome any input the folks on this thread have on this subject. Please, hope this doesn't represent me violating anti-multi-posting rules. I mean to play fair.
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Old 06-17-2018, 04:49 PM   #18
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While it is recommended that the oil drain plug crush washer be replaced each time the oil drain plug is removed and then reinstalled, you could reuse it once, twice, maybe three times.

My suggestion is to get a Fumoto oil drain valve and eliminate the removal and re-installation of the oil drain plug, including crush washers.

https://www.fumotooildrainvalve.com/f108s.html

Under the warranty, the oil change interval is miles or time, whichever comes first.
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Old 06-18-2018, 03:26 AM   #19
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OCI recommendations at the dealership level has a number of factors. On the older cars, the light use interval was 7500 miles, on the newer ones it's 6000 miles. One dealer I worked at ran 3750 mile intervals due to the fact that 90% of the people out there would be considered severe service. The last one did 5000 mile OCIs.
I prefer the 3750 for most people, as nobody actually checks their oil level, AND it makes it easy to do LOF, LOF + rotate, LOF, 15k service, etc. etc. etc.

I'm not a big fan of the fumoto valve, as it'll leave more oil in the pan and it becomes a bigger target to get smacked by rocks/debris. But they do keep idiots from stripping out the drain pan.
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