Engine Oil light
Is it ok to mix engine oils with a different brand? If not I just want to confirm that the dealerships use Mobil-1 so I can at least keep it in the same brand.
Mobil1 0w40
When I did my own oil change last week I used Motul 8100 X-Cess 5W40 (MB 129.5 approved)
I read somewhere that Steve at Weistec recommends 5w40 for M156 engines.
I would like to swap to Motul since a friend has Motul sponsorship and can get me 50% off on all Motul oil but their 0w40 isn't MB approved.
Last edited by cptdaz; Feb 9, 2012 at 12:55 PM.
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Quoted from Steve at Weistec:
We have taken apart many of these engines, and have documented any issues (if any) very well. Some of these issues that have been mentioned in the class action documents seem to be perhaps "exaggerated". We have not seen any lifter or camshaft issues, but these are a few things that we have seen that can be a potential problem down the line, and can also be a problem for a customer returning with the problem at a dealership. This might also be a reason why the customer might have been denied any kind of warranty of the defected parts or whatever the case may be.
Issue 1: These engines take 0w-40 synthetic oil from the factory. If you have the dealership change your oil they put 5w-40 synthetic oil. Although MB isn't admitting any type of guilt here, they have obviously learned to change the oil. The reason for this is because the lifters are known to bleed the oil out when the camshaft is in the correct position overnight or for a few days pressing against the lifter. When someone starts the car the next day you get the lifter tick which many people have complained about. If this happens enough times, it will cause an issue, and this can perhaps be the reasoning behind this.
Issue 2: When replacing or simply removing camshafts the lifter will expand from the pressure. The problem with this is the fact that simply installing the camshaft can be a problem now because the lifter will now hang the valve open for a while, and it is a possibility that if can bind the valve spring putting unwanted pressure on the camshaft, lifter, valves, etc. Now these are 1 out of a million chances of causing serious damage, but again it is possible.
Issue 3: As someone stated earlier, the lifter is very flat where it meets the camshaft lobe. This is a little odd in design because the lifter needs to have some kind of ability to spin in its bore during its motion. It might have been beneficial to give it a dome like shape.
Lastly, just an FYI for guys running the M156/M159 engine. If you haven't driven the car in a few days and you hear an kind of valve train noise, do not drive the car. Let it idle till the noise goes away. Also put 5w-40 in the engine if you haven't yet. Thanks.
Steve
Weistec Engineering
Last edited by Rsquad911; Feb 9, 2012 at 02:52 PM.
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Thank you very much for your post. This occurs as the automotive fluid standards have changed in the meantime (in May 2008)
AMG recommends the use of the following oils:
- Mobil 1 5W-40 for M156 engine (63er models)
- Mobil 1 0W-40 all other AMG engines (as well the AMG diesel engines that was used for the C 30 AMG)
- Mobil 1 5W-50 SLR engine
Before that change, the Mobil 1 0W-40 was used for the 63 models as well.
We hope that this information helps.
Best regards
AMG Private Lounge Team
http://bevo.mercedes-benz.com/bevolisten/229.5_en.html
How much did you add? A liter or so of 0w40 isn't going to change the viscosity much out of the 7-8 liters that are in there...
I had the oil change and they didn't notice anything strange. I was close to my first service so they cleared the light and gave me a checklist of what still could be done. I just drove it back and made sure to push it hard and didn't notice any ticking. All good! On a different note I went to Victoria Star Motors in Waterloo and was I ever impressed. They were all so knowledgeable and had so many great cars! Made me wish I knew they existed before I bought mine. I spent the whole time talking with a salesman named Dave who was great! He was up to date on all things Mercedes. I even found out the new SL and C AMG Blackseries will be at the autoshow in Toronto for anyone wanting to go check them out!



