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This is a discussion on Which oil do you use? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Mobile 1 synthetic ftw...that is when it comes time to change my oil and get rid of the stuff that ...

  1. #16
    Registered User Slider's Avatar
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    Mobile 1 synthetic ftw...that is when it comes time to change my oil and get rid of the stuff that came with the car.
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  3. #17
    Registered User drummerboy's Avatar
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    Motul 8100 (full synthetic)

    My dealer (flagship dealership of Subaru of Canada) offers M1 as part of the premium oil change service, but what they don't advertise is that they carry Motul too... I have to ask for it. It costs a little more, but I like it and makes the motor run silky smooth... if Motul is good enough for the WRC Subie, its good enough for me
    Last edited by drummerboy; 04-12-2007 at 05:36 PM.
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    Registered User big_sur's Avatar
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    mobil 1 +1

  6. #20
    Registered User tom'sti's Avatar
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    Royal Purple for engine and trans, Subaru LSD oil for the rear.
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  7. #21
    Registered User Slider's Avatar
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    How often do you change the tranny oil? Or at least when should it be changed
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  8. #22
    Registered User tom'sti's Avatar
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    i think the recommended is every 15k.
    Whoever appeals to the law against his fellow man is either a fool or a coward. Whoever cannot take care of himself without that law is both. For a wounded man shall say to his assailant,"If I live, I will kill you. If i die, you are forgiven. " such is the rule of Honor.

  9. #23
    Registered User armysti's Avatar
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    Quote Originally Posted by tom'sti View Post
    i think the recommended is every 15k.
    what is the best tranny fluid to use?

  10. #24
    Registered User scubby's Avatar
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    I've always used Castrol GTX 5w30 but seriously considering Royal Purple in the WRX...never owned a car this nice

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    Moderator Integra96's Avatar
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    Using Amsoil European Car 5W-40 right now. Have used M1 5W-30 in the past.
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  12. #26
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  13. #27
    Registered User abhiwan's Avatar
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    had my oil changed today...mobile 1

    even with synth. i change my oil every 3k.
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  14. #28
    Registered User tom'sti's Avatar
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    Quote Originally Posted by TheJ View Post
    3 in 1
    Yeah, and a little PB Blaster for cold weather!
    Whoever appeals to the law against his fellow man is either a fool or a coward. Whoever cannot take care of himself without that law is both. For a wounded man shall say to his assailant,"If I live, I will kill you. If i die, you are forgiven. " such is the rule of Honor.

  15. #29
    Registered User LIV 2 RLY's Avatar
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    Quote Originally Posted by yo vanilla View Post
    i've had alot of people tell me that synthetic oil is a waste of money. i usually find that those people dont know jack about oil. i.e. "its all the same" mentality.

    by C6 i am asuming you mean corvette. here's a tibdit i learned once. z06 engineers discovered a cost savings of $400 by switching to synthetic oil vs conventional. the synthetic oil by itsself lowered temperatures so much that they did not need to use an external oil cooler (thus the $400 savings). so the ls6 got factory fill M1.

    so for your sti, do some more research and decide. you want cooler oil temps, use a synthetic. you want to chance coking the oil, use conventional. (plus all the other differences of course)


    p.s. i've been using M1 for around 10 years now.
    I think you meant to say they eliminated the oil cooler because synthetic oil has a breakdown temperature which is alot higher than conventional oil. Although the synthetic oil may reduce friction and heat, the difference isn't much. So between the higher breakdown temperature of synthetic and the slightly (maybe 5 degree) lower temperatures because of the synth. oil they were able to eliminate an oil cooler.

    I would rather run inexpensive dino oil and change it every 3000 miles than run synthetic for 5-6k miles. I can't justify the price difference in a new car as long as the oil is meeting the manufacturers specifications, and isn't breaking down from aggressive driving, etc.
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  16. #30
    Registered User tom'sti's Avatar
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    Quote Originally Posted by armysti View Post
    what is the best tranny fluid to use?
    That is a hottly debated topic. Even with all the test data out there, I honestly think it all comes down to preference. Read the bottle, make sure what you're getting matches the requirements of your car. I use RP 75/90. The bottle says it is good for manual transmission, wont hinder synchro action but also contains a friction additive. I havent had any problems with it in 4k, even when cold(10F), it was fine. Plus the bottle says, adds horsepower!
    Whoever appeals to the law against his fellow man is either a fool or a coward. Whoever cannot take care of himself without that law is both. For a wounded man shall say to his assailant,"If I live, I will kill you. If i die, you are forgiven. " such is the rule of Honor.

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