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This is a discussion on Mobil 1 syntech problem within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I recently changed my oil to Mobil 1 5w30. i am in the So Cal area and was told the ...

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    Mobil 1 syntech problem

    I recently changed my oil to Mobil 1 5w30. i am in the So Cal area and was told the hot weather is very dangerous with this oil. I have been flammed for doing such and want to know what should i change to. i have an 07 wrx completely stock.
    Also from what i was told if i keep it under 4k rpms this oil will hold up ok. Please chime in opinions.

    what oil should i change to? what brand and what XXW XX?

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    Registered User Acrdys's Avatar
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    5w30 all year long :P

    Unless it get's really really hot

    10w30 summer
    5w30 winter


    or stick 10w30 all year long if it don't get that cold

    wait... your running synthetic right?

    I use mobil 1 super syn
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    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by wrb07x View Post
    i am in the So Cal area and was told the hot weather is very dangerous with this oil. I have been flammed for doing such
    By whom?

    and want to know what should i change to.
    So the specialist that told you the oil is wrong didn't know what oil is right?

    Also from what i was told if i keep it under 4k rpms this oil will hold up ok.
    Same source of info?

    Please chime in opinions.
    In my opinion none of this makes sense.

    what oil should i change to? what brand and what XXW XX?
    What does the owner's manual say?
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    by uncle scotty over at Nasioc.com
    he explained nothing but flammed me for choosing this oil.
    he then told me he used 10w40 valvoline. did not explain his driving conditions, temp, nothing, etc. no explanation why he chooses this stuff either. i then make another thread and he chimes in more useless info. i've read a lot on bobistheoilguy.com and havent really seen any negative about M1 5w30.
    im just so lost here. i thought mobil 1 is decent stuff....?
    i wish clubwrx worked at my work.


    he says its pure garbage and im a fool for choosing this oil.
    i asked him to explain and after time i got a warning 10 points from a "n00b moderator"



    yes, same thread different person


    thank you.
    i shat my pants when i first read his comments. assuming that if i drive over 4k rpms that the oil will shear and cause damage to my subie



    recommends 5w 30 and possibly 10w30 if it doesnt see weather below 0.

    because i plan on changing my oil under the 3k mark, someone please help, i've searched a lot and still kinda lost. oil seems to be a heated discussion in some of the other forums. i hear good and bad about the same stuff. who do i believe. i guess i need to take it "with a grain of salt" so to say....
    Last edited by wrb07x; 11-10-2008 at 09:49 PM.

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    He simply abides. SD_GR's Avatar
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    Sounds like you've had a rough time! No forum is without jackasses. It's unfortunate you ran across signs of that, especially about something so relatively trivial. People do get fanatic though as you've seen. Tell you what... I'll try to "level" with you:

    You did pose a good question: "Who do I believe?" Believe the manufacturer. The car is under warranty so you need to follow the requirements in the manual to maintain your end of the warranty agreement. Keep all receipts and follow the maintenance schedule stated (keep in mind though that Subaru issued a service bulletin that effectively shortens the maximum oil change interval to 3,750 miles or whatever the "severe" interval is in your manual, for reasons I won't bore you with).

    Anyway, in your manual, it will say something like "GF-4 and/or API SM." It will also list a range of viscosities. You can use any oil meeting those criteria as long as you follow the service schedule and keep your receipts. Use the Subaru filter, since it's one less thing to worry about under warranty and it's reasonably priced anyway.

    If you are worried about M1, don't use it. Pick another widely available brand (you want something easy to find anywhere for practical purposes -- easy local shopping, compepitive price, topping off, etc.). Try Castrol or Pennzoil or Quaker or Valvoline or whatever if Mobil1 concerns you. All these firms offer both synthetics and conventionals in 5W-30, 10W-30 etc. There doesn't have to be a rational reason to avoid Mobil1; life's too short to worry (I use the stuff, but not the 5W-30 any more, and in any case I'm a user, not a fanatic -- find something you or gurus you trust like to ease your mind). Check the oil routinely since oil consumption can vary with different types and as the motor ages etc. Keep it at the correct level, change it at the correct time, use the correct type, and go on with life.

    Another option: price it (look for coupons and consider they also wash the car typically) and have the dealer do it. There's no shame in that. I'd avoid quick-lube places (they terrify me!) but a dealer is fair game. Otherwise, shop for any oil with the specs you need according to Subaru. Go by advice, instinct, or even bottle colour. Bob's site is great as you've seen; look at UOA reports for your oil of choice and your motor and see how it does if you're worried.
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    SD_GR

    Thank you for your time!

    What bothered me the most was the fact that everyone on Nasioc seemed to know that M1 was gonna blow my motor (bearings). But i read over here at clubwrx just the opposite. oil debate seems to be never ending as well.


    I will go back to castrol gtx once this oil is ready to be changed,

    I was told that revving over 4k at anytime will shear this oil, i take it you do not believe this, correct? Although i now take suggestions with a grain of salt, you seem to be experienced and i've read through a lot of your posts.

    again thanks for your knowledge and suggestions!!!

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    He simply abides. SD_GR's Avatar
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    You're welcome. Either forum has all the info, it's just a matter of wading through it. I'd not discount a forum just because of a bad experience; try lurking and reading there too and you'll see it's very valuable.

    I do believe the oil will thin down with use. I don't believe 4,000 rpm is a magic number though, and I highly doubt catastrophic failures are due to oil choice -- not on stock motors used as intended (vs. modified motors with inadequate oiling and/or cooling used at their limits). In any case, what I believe isn't relevant, since there are data out there for almost any oil/motor combination (Bob's site, as you know). When I used M1 5W-30, it was the older, API SL "SuperSyn" formula. I found the motor consumed too much for my liking, so I looked at other M1 formulations and found two I liked (neither is a viscosity listed in the manual for warranty purposes, be warned): 0W-40 and 5W-40. Of the two, the 5W-40 is more robust as far as I can tell. It gave great UOA data for me and the motor uses less of it than any other M1 formulation. The 0W-40 is fine, but it does thin down to a 30W or so with use. However, this didn't bother me for two reasons: I used more, so I topped off and replenished the additives in doing so, and the oil then thickens back up with more age anyway.

    In any case, if you like GTX, use it. I have a motor that's been using it since new (a non-turbo Toyota 4-cyl) that now has 215,000 miles and counting. For reference, the distance between the Earth and the moon is a minimum of 221,000 miles, so the motor has almost gone the equivalent (none of this means anything, it's just a single experience, but it's a neat story so there you go...). GTX is cheaper than M1, has yielded some great UOA data (See Bob's site, again), and is widely available. I'd not hesitate to use it. Again, follow the owner's manual to the letter and keep receipts for warranty.

    You have a nice car, enjoy.
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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    DUB
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    Yes, the oil debate is never ending...after our planet has been annihilated by nuclear war the only thing left will be cokroaches [sic] and twinkies and they will spend all day arguing about which oil is best...

    Don't worry about what uncle scotty says, he is a very knowledgeable member of the Subaru community, but has unfortunately turned to the dark side and now uses his powers for evil. I think he answered the same n00b questions over and over one too many times and snapped. Now he just flames people. For whatever reason, the majority of NASIOC hates M1 unconditionally. Just like the majority of CWRX hates BOVs and Intakes. I chalk it up to following the herd.

    SD pretty much said everything that already needs to be said. I guess I'll add little, not sure what it's worth though.

    I hate to let everyone down, but ANY oil that meets the manufacturers specification is going to be just fine. It is absolutely ridiculous to think that you can't rev your motor above 4k because you have M1 5w-30 in it. Trust me when I say you will be fine. I just put in a fresh fill of that very oil on Saturday. Just now, coming back from a friends house, I found my self with some open road and put my foot into it. Guess what? My motor did not explode. As for your temperature related concerns; there is a little chart in your owners manual that tells you what viscosity is best in what temp range, go by that.

    Has anyone linked you to this thread yet? Used Oil Analysis: M1 5W-30 in '04 WRX (possible fuel to the debate) - NASIOC The fact is, if you want to see how an oil is doing in your motor, have a used sample analyzed. After reading these damn oil debate threads for over a year (not long compared to some of you, I know) I have decided to do just that. I have a sample from my aforementioned oil change sitting in my car waiting to be taken to the post office for it's journey to Blackstone Labs. If the results are poor, I will switch oils. If the results are good, I will wave my UOA in the face of the M1 nay-sayers while I say "eff you, GTFO!".

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    wow i love this site so much. brings tears to my eyes.

    dub thanks a lot for your time as well, very informative info here!

    please let me know how your UOA's turn out. as i will be sending mine in also.

    again thanks!

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    DUB
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    I just had another thought I will contribute for your benefit: Consumption.

    Automobile engines are a complex array of moving parts, and every one is a little bit different. For this reason, some motors burn more oil of different brands than others. Many people have found that their engine burns more M1 than they are comfortable with; 1 to 2 quarts per change interval. Switching brands often solves this problem.

    My motor burns absolutely zero M1 in 3500 miles. The oil level on my dipstick remains unchanged for my entire oil change interval. This, I believe, is a good thing.

    So, that's just something else to think about; keep an eye on your level.

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    DUB
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    Quote Originally Posted by wrb07x View Post
    wow i love this site so much. brings tears to my eyes.

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    Modil1

    Hi Ihave had 14 Subaru's from GC8, BugEYE, BlobEYE,Hawk EYE, Forester XT, Legacy GT, STI7,8,9. My point, some engines think M1 is a softdrink on a summer's day and others nothing not a drop. This is not down to driving, it is the car. Subaru South Africa think they are cleaver so I am currently stuffing them around, my 06 WRX wagon is using about 3 liters of oil between services. It does not consern me because I know if I go and change to Castrol RS it will stop, but Subaru said no only M1, now they will do a oil usage test, and if I realy get full of SHT they will replace the motor, nice new motor on 31000 miles.

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    Registered User teflon_jones's Avatar
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    I have used Mobil 1 oil and filters in all of my cars for the past 10 years and I have never had a single problem with anything that had to do with motor oil. This has included SUVs, sedans, and high performance cars like a 911. I change my oil every 8-10k miles or so, and I add a new quart every 3k miles because my car burns a good amount of oil (some do, some don't!). Yes, 8-10k miles. Go ahead and flame away, I have a direct line to the engineers at Mobil that developed the stuff and it's barely getting going at 10k miles, especially if it has been topped off a couple of times. In the Porsche 911, the recommended change interval is every 20k miles and comes with Mobil 1 from the factory. It even uses 5w30! So do you really think that oil isn't going to work?

    I currently use Mobil 1 5w30 in my STi with no problems after 26k miles including 13k miles at stage 2. Do I drive hard? The other day after I got home my front brakes were still smoking 20 minutes later.
    Scott
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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    I use 5W30 in the winter and 10W30 in the summer to protect from heating issues, but I see no reason why the 5W30 would be bad to run all year round. It's recommended oil by Subaru and it's designed to run that oil.

    Don't let idiots push you around because they choose to go a different route.

  16. #15
    nfm
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    I'm using Mobil 1 Synthetic 10W30 with Mobil 1 oil filter, no problems at all.
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