[W126 Coupe] Engine Ticking 89 560 SEC & Harder Starting

[Stuart Corkran]

Mobil 1 is a great oil BUT ! it is not suited for older engines. You will find if you change your oil back to a straight 20w like castrol or similar it will go back to the existing 160,000 noise. Mobil 1 tends to drain out of hydraulic lifters over night and has trouble getting pressure in first starts.

My boss put Mobil 1 in a 1980 280se from brand new as he was a Mobil dealer, this car has now done 853,600 klms on the same engine and only uses .5 of a litre between 10,000klm services. I think that .5 of a litre is leaking. So I put it in my 1985 380 sec with 178,000klms on the clock and I got the same symptoms as you are suffering. Changed back to a straight 20w and it stopped.

Cheers Stu-e.
  ----- Original Message ----- 
  From: webjamin at att.net 
  To: Mercedes Coupes Mailing Lists 
  Sent: Thursday, December 21, 2006 6:44 AM
  Subject: Re: [W126 Coupe] Engine Ticking 89 560 SEC & Harder Starting


  Hi Jack,



  I had the same thing on me 86'. Took it into my mechanic and he replaced a couple of lifters and adjusted a few things on the drivers side and now 80% of the sound is gone. The other 20% is coming from the passenger side, which I plan to have him do soon. As I recall the cost was <$200.00. Good luck.



  Lance


    -------------- Original message from XKEOTS at aol.com: -------------- 

    Hi,

    I am starting to develop a more frequent ticking in my 89 560 SEC motor.
    It used to happen once every month now it is happening every other day.
    When I do my first start of the day I hear a ticking in the motor until I rev it a few times or drive it to a decent rev then it goes away.
    The motor is also not starting as quickly as it was (more cranking) even a month back. I even have to hold the gas pedal to the floor once in a while to start it.
    The car has 171,000 on it.
    At 160,000 I had a new fuel dist, new timing chain & tensioner, plugs, dist cap & rotor, idle speed switch, idle speed control actuator, lambda set, all fuel filters & (oil filters, & oil 5,000 with Mobil 1), timing set, new valve cover gaskets. I think a little more but I cannot recall.
    Any suggestions?

    Thanks
    Jack 


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