Petrol Additives (again)

Discussion in 'Engine' started by R2D2, Jan 13, 2011.

  1. R2D2

    R2D2 MB Club Veteran

    Messages:
    6,935
    Joined:
    Mar 23, 2004
    Car:
    C350
    My car has done 92,000 miles and I thought it's innards might benefit from some pampering. I bought a bottle of STP Petrol Additive and used half a bottle on each of two consecutive tanks of petrol. The result was I think my mpg may have improved a little but the car seems quieter and smoother??

    Spurred on by my successes with the first bottle of additive I went back to get a second bottle. It was then I realised that I'd used Petrol additive for carb cars and there was a actually a different STP for injection cars. I've bought one for injection cars and yesterday added the first half bottle to the next tank of petrol.

    This morning I drove it for the first time and thought that the idle was fluctuating slightly and that the car may have slightly shuddered on pulling away once on my journey. Has anyone else used these additives and are my symptoms just the car getting cleaned out?

    Many thanks
     
  2. philepo

    philepo Hardcore MB Enthusiast

    Messages:
    294
    Joined:
    Jun 5, 2009
    Car:
    C270 CDI (2004 w203)
    This is pure psychology.

    This kind of snake oil would be added by castrol et al if it was that good.

    Your car is fine and you mind is playing tricks!
     
    1 person likes this.
  3. OP
    OP
    R2D2

    R2D2 MB Club Veteran

    Messages:
    6,935
    Joined:
    Mar 23, 2004
    Car:
    C350
    You could be right but then Shell reckon that their premium fuels have lubricants, detergents etc etc....
     
  4. kwakdonut

    kwakdonut Hardcore MB Enthusiast

    Messages:
    2,744
    Joined:
    Jul 22, 2006
    Location:
    Highworth, Wiltshire
    Car:
    Frod Mundano TDCi, Kawasaki z650
    STP fuel additive has little in the way of benefits. The only additives I've ever used that are worth the cost are Forte and Millers
     
  5. KillerHERTZ

    KillerHERTZ Administrator Staff Member

    Messages:
    16,585
    Joined:
    May 21, 2003
    Location:
    Cambridge
    Car:
    CLS63 AMG
    Clean your car, it will drive better and faster too! :D
     
  6. Howard

    Howard MB Club Veteran

    Messages:
    18,624
    Joined:
    Apr 23, 2004
    Location:
    Toad Hall
    Car:
    CLS 500 / A 150
    It does !!!!!

    Mine is very sluggish at the mo , but then i haven't cleaned it in 2 1/2 months .... it's punishing me !
     
  7. Mike Walker

    Mike Walker Hardcore MB Enthusiast

    Messages:
    2,572
    Joined:
    Jul 9, 2008
    Location:
    North Kent
    Car:
    Mercedes W204 C220cdi Estate Ford Fiesta Mk 4
    My car had done around the same mileage and on the basis of the above advice I will continue to clean it regularly and leave the rest alone!
     
  8. NW_Merc

    NW_Merc Banned

    Messages:
    5,918
    Joined:
    Sep 3, 2005
    Location:
    Over here, sometimes over there
    Car:
    1994 Mercedes C180 classic
    I use Forte, you can buy it off ebay, it seems to be better than other brands and their research on the website speaks for itself.....
     
    1 person likes this.
  9. RBYCC

    RBYCC Hardcore MB Enthusiast

    Messages:
    1,132
    Joined:
    Aug 8, 2007
    Location:
    REHOBOTH BEACH DE USA
    Car:
    1971 280SL, 1988 300CE TT, 1994 E320 CAB, 1999 AMG C43, 2005 AMG G55K 2008 CLK63 AMG BLACK SERIES
    Mercedes USA recommends the use of Chevron Techron every few thousand of miles to keep the injectors clean.

    Most tier 1 petrol uses this additive.

    Below is from Mercedes Benz USA factory approved service products.
    UK should have a similar factory bulletin

    "Engine Product Name/Part Number
    [FONT=CorpoS,CorpoS][FONT=CorpoS,CorpoS]Fuel additive for gasoline engines [/FONT][/FONT]

    [FONT=CorpoS,CorpoS][FONT=CorpoS,CorpoS]MB Part No. A000 989 25 45 12 [/FONT][/FONT][FONT=CorpoSDem,CorpoSDem][FONT=CorpoSDem,CorpoSDem](100 ml, 3.4 fl oz container) [/FONT][/FONT]

    [FONT=CorpoS,CorpoS][FONT=CorpoS,CorpoS]Techron Concentrate Plus Fuel System Cleaner [/FONT][/FONT][FONT=CorpoSDem,CorpoSDem][FONT=CorpoSDem,CorpoSDem](588 ml, 20 fl oz container) "[/FONT][/FONT]
     
    1 person likes this.
  10. philepo

    philepo Hardcore MB Enthusiast

    Messages:
    294
    Joined:
    Jun 5, 2009
    Car:
    C270 CDI (2004 w203)
    All decent fuels and oils have additives. But they know what they're doing.

    Stear clear of additives i say!
     
  11. OP
    OP
    R2D2

    R2D2 MB Club Veteran

    Messages:
    6,935
    Joined:
    Mar 23, 2004
    Car:
    C350
    Having said that RBYCC is correct that MB recomend one these days...
     
  12. DITTRICH

    DITTRICH Hardcore MB Enthusiast

    Messages:
    1,603
    Joined:
    Apr 16, 2004
    Location:
    London
    Car:
    W202 C230K + S124 E300D
    I buy redex 2x per year when asda do their promotions.
    I put two whole small bottles into one full tank which is overkill.
    Total cost = £4 twice per year.
     
  13. hi_flyer437

    hi_flyer437 Active Member

    Messages:
    79
    Joined:
    Apr 15, 2008
    Location:
    Oxfordshire
    Car:
    E270 CDI; A160 CDI; Saab 9-3 Convertible
    I've had Forte recommended also (though not yet tried it). The recommendation was every 6000 miles; does this sound about right?
     
  14. BenzedUP

    BenzedUP Hardcore MB Enthusiast

    Messages:
    4,112
    Joined:
    Oct 23, 2005
    Location:
    London & Surrey.
    Car:
    NA
  15. C43AMG

    C43AMG MB Club Veteran

    Messages:
    6,772
    Joined:
    Apr 15, 2005
    Location:
    Weybridge. U.K
    Car:
    500L ( W221 ), 2014 AMG CL 5.5 Biturbo ( W216 ) 2014 Brabus Smart ( 451 Coupe ) Mapped 130bhp
    I was reading the CL's Manual and they say not to use fuel additives.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.