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CLK500 Rattle on start up

Posted: Thu 31 Mar, 2016 7:33 pm
by gassit320
Hi all
I realise this is not a handyman fix issue but I guess it would help me to know if anyone else has had this and/or if they've had it repaired.
Occasionally (about 1 in 20 starts) there is a rattle when the car first starts, usually when its cold and lasts only a second, from speaking to my mechanic it sounds like it could be the timing chain tensioner, extremely annoying as the car is 1 owner, FSH and under 90K !!
Any input greatly appreciated
Cheers

Re: CLK500 Rattle on start up

Posted: Thu 31 Mar, 2016 9:28 pm
by AMGC36
Hi
Check that the right oil is used ??

Re: CLK500 Rattle on start up

Posted: Fri 01 Apr, 2016 10:26 am
by gassit320
Thanks Stefan, yes I am going to get the oil and filter changed soon, even though it's apparently 8000Ks to the next service.

Re: CLK500 Rattle on start up

Posted: Wed 13 Apr, 2016 2:32 pm
by gassit320
Changed the oil and filter, according to my mechanic oil was fine but very thin, they may have gone with 0W40 which (on research) is really for new engines and very cold weather. I have gone to 5W50 mobil 1 and the engine seems (?) quieter and haven't had the rattle since, fingers crossed

Re: CLK500 Rattle on start up

Posted: Wed 13 Apr, 2016 9:56 pm
by Ivanerrol
Stick to the M.B. recommended spec - i.e. Mobil 1 0-40W.

These engines are intolerant of the incorrect recommended oils and infrequency of oil changes.

Forget the output of the cluster indications of service intervals.

Change the oil every 10K's or at least after 9 months irregardless of the K's. The MB specified oil filters specified for these engines are mad of fleece and not paper or cardboard. Don't skimp on the filters.

The M112 and M113's operate at very high temperatures for emission reasons and the oils must be top notch to compensate.

I have a garage queen M112 engine. It does 8 - 10 K's per year which the majority of is taken up of trips between Melbourne and Noosa return. I change the oil after every trip regardless. If I hear overhead noise
on startup the oil gets changed tout de suite.