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Thread: Question for the oil experts.

  1. #1
    VIP-Member Johnsdutton's Avatar
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    Vehicle : Signum

    Trim : Elite

    Engine : 3.2 v6

    Year : 2004

    Mileage : 110,000

    Default Question for the oil experts.

    I ordered Castrol Magnatec to do an oil change on my Signum 3.2.
    Eurocarparts have sent, ahem, Ford spec instead of Vauxhall/ GM spec.The question is do I use it or return it, what are your thoughts?
    3.2 v6 Signum and loving it

    http://www.freewebs.com/johnsdutton/

  2. #2
    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

    Trim : LE/VXR

    Engine : 2.0 cdti/1.6 Turbo

    Year : 13/07

    Default

    Depends how fussy you are buddy tbh

    IMO 5w-30 fully synth is 5w-30 fully synth no matter what they have written on the bottle. Not sure if there is a genuine difference or if it's just for manufacturers warrenty purposes tbh

    I personally always use the "For Vauxhall" magnatec but I am fussy

    Found this on another website, make up your own mind

    If you took the Ford oil and the Vauxhall oil and looked at them - you wouldn't really see much difference and to many people, as they are both a 5W-30 - they would assume they are the same ( and many people do ! ) - but unfortunately they are not. It's all to do with the specification and HTHS values ( High temperature high shear ) - basically although they are both classed as a 5W-30, at 150ºc if you measured the viscosity of the two oil oils, the Ford one because it is designed to meet the ACEA specification A1/B1 A5/B5 ( and Ford WSS-M2C-913C ) is classed as fuel efficient with a low HTHS value and would be thinner viscosity than that of the same viscosity non fuel efficient specification ACEA A3/B4 with a higher HTHS value. If you consider that the main function of an oil is to keep fast moving metal surfaces apart - if the oil isn't thick enough, then you could get metal to metal contact and wear would quickly take place. By the way ACEA specs - A is petrol, B is diesel.

    So, using a fuel efficient oil in an engine not designed for that type of oil could damage the engine - and that's why if you look in a Vauxhall handbook, it will likely say " Vauxhall does not recommend the use of fuel efficient oils " - because they know that they are thinner, and if used could cause engine damage. Also, Vauxhall run extended drain intervals whereas Ford do not, so the specification of the Vauxhall oils take into account this as well - hence the need for the Vauxhall spec - GM-LL-A/B-025 ( or DEXOS 2 now )

    That's why there are so many different oils on the market - not because the oil companies want it that way, but because of all the different specifications the oils have to meet - and in many instances, by meeting one specification, you aren't able to meet another with the same oil ... so need another oil ...
    Last edited by John LE; 7th June 2012 at 17:17.

  3. #3
    VIP-Member Johnsdutton's Avatar
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    Vehicle : Signum

    Trim : Elite

    Engine : 3.2 v6

    Year : 2004

    Mileage : 110,000

    Default

    Cheers John,
    Thanks for quick reply. I will probably use it, unless someone tells me it
    will blow my engine up. LOL. Just wait till we see the replies now.
    3.2 v6 Signum and loving it

    http://www.freewebs.com/johnsdutton/

  4. #4
    Ex-Staff Full Member John LE's Avatar
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    Vehicle : Facelift Insignia/Corsa D

    Trim : LE/VXR

    Engine : 2.0 cdti/1.6 Turbo

    Year : 13/07

    Default

    As per my edited post bud

    Tbh, they sent the wrong stuff. Send it back and tell them you want the stuff you ordered

    Or depending on how much it cost, send it back and get it from halfords, it's 17.50 a bottle

  5. #5
    VIP-Member Johnsdutton's Avatar
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    Vehicle : Signum

    Trim : Elite

    Engine : 3.2 v6

    Year : 2004

    Mileage : 110,000

    Default

    Read edited post, thanks mate it is going back.
    3.2 v6 Signum and loving it

    http://www.freewebs.com/johnsdutton/

  6. #6
    VIP-Member Das's Avatar
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    Vehicle : Lada

    Trim : Riva

    Engine : 6.0 V12

    Year : 1954

    Mileage : 567890987

    Default

    IIRC the Ford spec Magntec is designed for better MPG, I doubt it will make much odds to your 3.2 john, lol.

  7. #7
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    Default

    Different oils have different detergent that are designed for your engine, bearings , seals etc. The viscosity of oil is just one part of it's specification. Send it back and get what you originally ordered.

  8. #8
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    Default

    used it last 15 years mate. you want a3 b4 magnatec in them. ive had it in my 3.2 for a year now with no probs atall. the one i go for normally has opel cars on the bottle

  9. #9
    VIP-Member Johnsdutton's Avatar
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    Vehicle : Signum

    Trim : Elite

    Engine : 3.2 v6

    Year : 2004

    Mileage : 110,000

    Default

    Thanks for replies guys. It is going back and replaced with correct spec. Well done Eurocarparts for prompt and efficient service.
    3.2 v6 Signum and loving it

    http://www.freewebs.com/johnsdutton/

  10. #10
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    Default

    Right move IMO!

    I remember reading somewhere that the oil is specifically low sulpher for the DPF which is in your signum. If you had a non-DPF vehicle, I would say you should not be so concerned.

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