Date registered: Mar 2008
Vehicle: 1984 300D
Location: S. California
Mentioned: 0 Post(s)
Quoted: 73 Post(s)
Besides the Oil itself issue there is 2 O-rings at the Bottom of the Oil Filter Tube that a lot of Mercedes owners do not know is there and they do not come in the Oil Filter Kit.
The stock setup calls for 2 of the same 6mmIDx10mmODx2mmW O-rings even though the upper diameter one of the O-rings goes on is larger.
Autozone sells a Metric O-ring assortment made by Dorman for less than $8.
Dorman Metric 172 piece O-ring Value Pack #799-450
In it are 24 of the 6mmIDx10mmODx2mmW O-rings that you need for the bottom of the Oil Filter Stem: enough for 12 O-ring changes if you use the same sized O-rings each time you change it.
Some People including Myself use a 7mm O-ring for the upper one but that is your choice as stock is the 6mm one.
On 617.952s you can substitute a 7mmx11mmx2mm in the upper groove on the Oil Filter Stem instead of the 6mmx10mmx2mm. If you do that you have enough O-rings for 24 O-ring changes. (This was suggested by another member and I did it and it works; since I bought the O-ring kit I do this on mine.)
My experience is that you do not need to change those O-rings with every Oil Change but of course that is up to you.
There is more then a few stories of Oil Change Places that have had bad outcomes. Usually from stripped Oil Filter Cap Nuts/Studs or the Oil Pan Bolt.
Last edited by 300Dman; 05-15-2014 at 12:26 PM.