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Thread: First Oil Change Interval ?

  1. #21
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    Quote Originally Posted by bluesubie View Post
    I'm not a chemist either. Just an oil dork.

    I'm glad to listen to an oil dork; I learn things.

    Thanks, Dennis.

  2. #22
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    If you use oil viscosity that is not recommended by subaru and you have problems with the engine, can subaru void the warranty?

  3. #23
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    Quote Originally Posted by RLEWINTER View Post
    If you use oil viscosity that is not recommended by subaru and you have problems with the engine, can subaru void the warranty?
    The language in the manual is in a gray area, IMO, since they do not define the thicker viscosity.

    ...An oil with a higher viscosity (one with a higher value) may be better suited if the vehicle is operated at high speeds, or under extreme load conditions ...

    And of course, you have to describe the high speeds or extreme load conditions which may void your warranty anyway.

    Subaru has been weird with oil recommendations. For over 15 years, SoA has allowed 40 grade oils in the EJ engines. All of a sudden during the 2011 Model Year, they dropped the thicker recommendations (likely to help with fuel economy requirements). I've seen people with 2011's and 2012's run into issues at the dealer running 5W-40. OTOH, some dealers install 5W-40 that customers bring with them.

    The BRZ manual was probably written by Toyota, IMO. The Subaru manuals are more confusing.

    -Dennis

  4. #24
    Senior Member brianch's Avatar
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    I think when it comes to oil. If you aren't sure. Just use OEM. If you know, use whatever you want if you can justify it.

  5. #25
    Junior Member iwantmybrz's Avatar
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    I'll be doing mine at 3,250 or so and plan on using the stock 0w-20 after much research on the topic. Seems the 0w-20 is the best choice during the first 10k or so based on what I've been told. Plus, due to the use of direct AND port fuel injection on this new D-S4 powerplant, the jury's still out on how this engine will handle other oils. I'm waiting to see the results others have before switching from the stock stuff, plus I've opted for the 7 year/70k Subaru extended warranty and am a little concerned about giving Subie any wiggle room should I have problems and have used anything but the stock Subie stuff.
    -
    On a related topic, I'm interested if anyone has had a similar oil consumption experience.
    -
    After nearly 2,800 miles of mixed driving, I was surprised to discover that I used one full quart of 0w-20 synthetic motor oil in my 2013 BRZ. I understand that this new, naturally aspirated boxer engine runs at a relatively high 12.5:1 compression ratio, and that the stock oil is a very lightweight 0w-20, but even so, I was surprised by the engine’s consumption. I did heed the owner’s manual recommendation of “driving nicely” and not exceeding 4,000 RPM during the first 1,000 miles and further realize that during the break-in period on some engines, oil consumption can be higher while the rings seat, and so on, but I was wondering if anyone else has had a similar experience with their D-S4 Boxer?

    Thanks,

    Cobra Joe

  6. #26
    Senior Member brianch's Avatar
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    Nice first post. Not sure if I've heard of others burning a quart under 3000 miles of gentle driving. Sounds a bit extreme.

  7. #27
    Junior Member iwantmybrz's Avatar
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    Thanks for the reply.
    -
    It seemed like too much consumption to me as well, but it's my first boxer so I figured maybe it's normal kinda like with rotary engines. I've checked for leaks and cannot find any. I've posted a similar inquire on other forums but it seems as though many users changed their oil before they hit the first 1,000 miles, most using AMSoil, Mobil1, Royal Purple or the like.
    -
    I'll update this post when I get more info
    -

  8. #28
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    Quote Originally Posted by iwantmybrz View Post
    After nearly 2,800 miles of mixed driving, I was surprised to discover that I used one full quart of 0w-20 synthetic motor oil in my 2013 BRZ. I understand that this new, naturally aspirated boxer engine runs at a relatively high 12.5:1 compression ratio, and that the stock oil is a very lightweight 0w-20, but even so, I was surprised by the engine’s consumption. I did heed the owner’s manual recommendation of “driving nicely” and not exceeding 4,000 RPM during the first 1,000 miles and further realize that during the break-in period on some engines, oil consumption can be higher while the rings seat, and so on, but I was wondering if anyone else has had a similar experience with their D-S4 Boxer?

    Thanks,

    Cobra Joe
    There's actually a thread at Subaruforester.org about some owners having oil consumption with 0W-20. The Forester FB engine was the first Subaru engine in N. America to spec 0W-20. I expect that Subaru of America will stick to their mantra of 1 qt. per 1,000 miles as being acceptable (although I think this was changed to 700 or 800 miles). I think that is a bit excessive.

    The usage might just be part of the break-in process. My only suggestion is to just sample different oils as consumption rates can vary. I've broken in my last three new Subaru's "by the book", but I now think that is not an aggressive enough of a break-in. There have been a couple of BRZ and FRS owner's popping up over at bobistheoilguy.com and they will be posting uoa's over the coming months as they get some miles on their cars. It will be intersting to see their results.

    If I were trying to curb consumption with a 0W-20, I would look for an oil with a high HTHS and a high viscosity at 100C. This info can be found in the Product Data Sheets on the oil manufacturers web site. For example, the Toyota branded 0W-20 is on the light side of a 20 weight while Amsoil OE and XL lines are on the heavy side.

    More comparisons:

    Mobil1 0W-20 and Amsoil 0W-20 XL.
    The High Temp High Shear on both is 2.7, but the viscosity at 100C is slightly thicker on the Mobil1 (8.7 vs 8.3). The thickest that a 20 weight oil can be at 100C is 9.2 cst's.

    -Dennis
    Last edited by bluesubie; 07-24-2012 at 08:03 PM.
    BRZ Driver likes this.

  9. #29
    Senior Member brianch's Avatar
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    Would oil consumption be less if you used 5W30 or something thicker? or 5W20

  10. #30
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    Quote Originally Posted by import_nation View Post
    Would oil consumption be less if you used 5W30 or something thicker? or 5W20
    Tough call. Maybe less with 5W-20, since they use less viscosity improvers and don't need to acheive as wide of a viscosity range as 0W-20. Viscosity improvers are the first thing to break down in oil. Although, sometimes it just comes down to trying different oils different brands. The quality or type of viscosity modifers may play a factor as well. The original green version of German Castrol 0W-30 didn't use viscosity improvers.

    Another helpful thing to look at is NOACK volatility test results. Resource Room
    When an oil has a lower NOACK percentange it is usually more stable and will evaporate less. Unfortunately, not all oil companies publish their NOACK results. Amsoil lists theirs but Mobil1 does not.

    Although, in the case of Pennzoil Platinum, the 0W-20 has a lower NOACK than the 5W-20. http://www.epc.shell.com/Docs/GPCDOC...1202271153.pdf

    With the technology of oils today, sometimes it's not as easy as picking a number on the bottle. With my Forester turbo, I've tried all kinds of thin 30 weights and thick 40 weights and I have consumption when I drive on long trips (3,250 rpm's at 70 mph). I'll be switching to old fashioned 10W-30 next. Notice the very low NOACK on the Pennzoil 10W-30 above.

    As with all oil threads, it looks like we've covered 5 or 6 topics now.

    -Dennis
    Last edited by bluesubie; 07-25-2012 at 05:24 PM.

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