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Thread: German Castrol 0w30 or Bmw full synthetic 5w30

  1. #1
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    German Castrol 0w30 or Bmw full synthetic 5w30

    What do you think is better for my 335i the German Castrol 0w30 or BMW full synthethic 5w30 motor oil? I can get the dealer oil for $6.73/litre or the German Castrol is on sale this week at Canadian tire for $7.47/litre.

  2. #2
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    Dealer, why would you go elsewhere when you car is tested with that oil and it is cheaper on top of that.
    "Mit der Dummheit kämpfen Götter selbst vergebens", Friedrich von Schiller
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  3. #3
    mattjw916's Avatar
    mattjw916 is offline I had something for this BMW CCA Member
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    use what the manufacturer recommends...
    current garage: 2011 BMW 335xi M sport, 2011 BMW R1200GS, 2006 325xi, 1998 Ducati 748, 1975 Chevrolet Cosworth Vega #1965

  4. #4
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    I beg to differ....

    What BMW uses is not synthetic oil. It uses a Base III stock, which, among other things, is based on natural oil products. A loophole in the law allows those blends with additives to market themselves as "synthetic", when if fact they are not. Mobil 1 is a prime example.

    If you are worried about using the cheapest oil, perhaps a Honda is in your future.

    Just because BMW "recommends" it is more than likely a reason to stay away from it. Think other examples: "lifetime" fill on tranny and diff fluids, oil changes at 15k to 17k, etc. Of course they recommend these intervals and products, as they are paying for them, not you.

    The major reason for the use of the German 0w-30 is the fact that is made from a class IV base, meaning no natural oil is in it. All man made. And most importantly, it has a higher vaporization temperature, which will keep the gasoline which is now diluting it as a result of direct injection, from vaporizing out the crank case and fuming up the intake runners to back of your valves, causing carbon build up there. Wait till you have to pay to have your valves cleaned. You won't mind paying a little more per quart thereafter.

    After having to have my valves cleaned, under warranty, I learned quite a bit about these alternative lube products from some racers who hang out on a certain oil and lubrication web site. Since switching, no more carbon build up, car runs smoother and cooler, and mpg increased about 1.5 mpg on the average. Available at Autozone.

    Try it.
    david: '07 335i coupe Dinan S2 / '11 Scion tC / '08 Subaru Outback

  5. #5
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    The BMW blend is fully synthetic. It is actually the rebranded European Castrol fully synthetic blend. Got solid proof of it being otherwise? if so, please share it, we'd be very interested to see it.
    Last edited by mryakan; 06-15-2011 at 03:00 PM.
    "Mit der Dummheit kämpfen Götter selbst vergebens", Friedrich von Schiller
    "Life is simple, people make it complicated"
    About me: http://forums.bimmerforums.com/forum...82&postcount=4
    Current Car (delivered 20/11/13): 2013 F30 335i xDrive M-sport; 6MT; Glacier Silver/Black Dakota; Individual Options: Sirius+Variable Sport Steering+Adaptive M Susp.+M Sport Brakes+19" 403M (winters: Motegi MR118 Black); ZWP (Premium Pak): Nav+ComfortAccess+HK-Audio+RearViewCam+PDC+UniversalRemote+AutoDimExtMi rrors+Lumbar+Alarm; MODS: OEM painted trunk spoiler
    <-click to enlarge | >> More here

    Previous Cars: 2011 e90 328i 6MT ZSP (Aug 10-Nov 13); 07 e90-323i ZSP (May 07 - Aug 10); 97-318ti ZSP (Feb 97 - May 07)

  6. #6
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    show

    evidence of re-branding.
    david: '07 335i coupe Dinan S2 / '11 Scion tC / '08 Subaru Outback

  7. #7
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    Quote Originally Posted by derbim View Post
    evidence of re-branding.
    No, evidence that the rebranded BMW oil is not fully synthetic, such as official BMW oil composition list, or an oil analysis from a trustworthy lab.
    "Mit der Dummheit kämpfen Götter selbst vergebens", Friedrich von Schiller
    "Life is simple, people make it complicated"
    About me: http://forums.bimmerforums.com/forum...82&postcount=4
    Current Car (delivered 20/11/13): 2013 F30 335i xDrive M-sport; 6MT; Glacier Silver/Black Dakota; Individual Options: Sirius+Variable Sport Steering+Adaptive M Susp.+M Sport Brakes+19" 403M (winters: Motegi MR118 Black); ZWP (Premium Pak): Nav+ComfortAccess+HK-Audio+RearViewCam+PDC+UniversalRemote+AutoDimExtMi rrors+Lumbar+Alarm; MODS: OEM painted trunk spoiler
    <-click to enlarge | >> More here

    Previous Cars: 2011 e90 328i 6MT ZSP (Aug 10-Nov 13); 07 e90-323i ZSP (May 07 - Aug 10); 97-318ti ZSP (Feb 97 - May 07)

  8. #8
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    checkwww.bobistheoilguy.com

    several threads there about this issue.
    david: '07 335i coupe Dinan S2 / '11 Scion tC / '08 Subaru Outback

  9. #9
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    The reason I thought the 0w30 was a little better was being a 0 weight oil it would be thinner at start up where the most engine wear happens.

  10. #10
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    http://www.bobistheoilguy.com/forums...&Number=721214

    Here is a link to one of many BITOG threads.

    All the info I have found indicate the oil is a Group 3 oil, not a bad oil, not a great oil, but it is Group 3.

    Calling oils sold in the US Full Synthetic has a lot to do with legalities & not much to do with base stock.

    Last edited by froggy47; 06-17-2011 at 12:41 AM.
    07 328i coupe, 95 M3 coupe, 04 Z06 Corvette, 04 Lexus IS300, several SUV's.


    I have a Bentley service manual & still want to post this question, thanks.

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