Not satisfied with Mobil-1 0-40w
Last edited by 007_e350; May 31, 2009 at 11:57 PM.
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Are you sure this is the typical wear type in the engine? Perhaps the limiting factor is something different than the one tested and then you might select a worse oil brand.
Also I'm not familiar with Mobil oil naming in the US, is this mobil oil that was tested the same 229.5(1) oil that MB recommends?
Mobil 1 0W-40 is a better oil and is fully synthetic and should have performed on par with the Syntec version in the chart. Unfortunately, 0W-40 was not used in the comparison.
Where is the chart on that?
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Comparing this to another Mobil 1 product and attempting to form a comparison is "sheer" folly
GC is made in Germany (the only Castrol sold here that is made in Germany, all others are U.S. made) while M1 is made in the U.S. Most U.S. "synthetic" oils are not true synthetics compared to the stuff made over in Europe. There are a few good articles on the net about this. There has also been debate in the past with 0w-40 on whether it is a true synthetic or not but recently they started adding PAO into 0w-40.
You can always do a oil analysis on both and see how they perform in your engine. This would probably be your best option. $20 from Blackstone Labs for an UOA (used oil analysis). If you go on their site, they send you a used oil sample collection kit for free.

But I have some questions in my mind... I have a 2003 220CDI, and till 60k km I used the oil my MB dealer put in, but in the 60k service I gave them Castrol 0w30 to use, and after that I started to hear some clicking noises from the engine, only when hot!!!
The noise is still there, even after I changed it to Castrol 5w30 on the 100k km service.
Now the car have 130k and still running with 5w30 (used by MB dealer, not me this time) and I'm thinking start using some other oil 5w40 as recommend by some friends, but an w40 oil is ticker at higher temps or what?
I can't figure out what to use after some reading on oils and centistrokes and etc. I'm confused, and a bit affraid on what can happen on my engine, since it's heavy moddified for the last 30k km
But I have some questions in my mind... I have a 2003 220CDI, and till 60k km I used the oil my MB dealer put in, but in the 60k service I gave them Castrol 0w30 to use, and after that I started to hear some clicking noises from the engine, only when hot!!!
The noise is still there, even after I changed it to Castrol 5w30 on the 100k km service.
Now the car have 130k and still running with 5w30 (used by MB dealer, not me this time) and I'm thinking start using some other oil 5w40 as recommend by some friends, but an w40 oil is ticker at higher temps or what?
I can't figure out what to use after some reading on oils and centistrokes and etc. I'm confused, and a bit affraid on what can happen on my engine, since it's heavy moddified for the last 30k km

My guess is the clicking is hydraulic lifter leakdown. Probably won't hurt anything as the engine rpm increases so does the oil pressure to the lifters and this will take up valve train clearance. Probably some engine wear resulting in lower oil pressure is the real cause. In this case I would use the 0w40 for the 40 part to increase oil pressure at lower rpm's to lower the noise on the lifters. But your choice. I always use the M1 0w40 with 1 exception. The dealer didn't fully tighten the oil plug and while traveling I was low on oil. I took the approach of "incorrect oil was better than NO oil" so I topped off with M1 10W30 and completed the trip. Then took it back to the dealer for the leak. Otherwise ONLY M1 0w40 goes in our E500.


They need to open the engine to detect the problem, but I never had oil wear, only the normal and everything looks ok now for 70k km!
They suspect that could be oil pump chain, but never eard on a problem like this on any MB car, and there is more cars out there doing the same noise...
So, the noise is present only when the engine is hot, should I change to w40 for better oil pressure at high temps?
Should stick to 5w since the engine have 130k km now or 0w is good?

They need to open the engine to detect the problem, but I never had oil wear, only the normal and everything looks ok now for 70k km!
They suspect that could be oil pump chain, but never eard on a problem like this on any MB car, and there is more cars out there doing the same noise...
So, the noise is present only when the engine is hot, should I change to w40 for better oil pressure at high temps?
Should stick to 5w since the engine have 130k km now or 0w is good?
I agree though if the noise sounds like chain noise and is on the front of the engine it probably is. I have only broken 1 timing gear in 45 years and that was in 1973 with a nylon gear. But I suspect you have a worn gear chain setup. Unfortunately the only way to know for sure is to open it up. Sometimes a timing chain failure can destroy the engine by the piston hitting an open valve if it is a timing chain. I thought the oil pump was direct drive with no chain so this is a new one on me to have a chain drive pump.
I don't know what Castor you were using from a spec view point but I would go check to see if it is on the approved list for your engine. I am thinking they used a castor that might not be approved. For Mobile the only Mobile 1 oil approved (exclusive of diesel) is the European Formula 0w40. So perhaps the castor didn't meet the MB specs and now you have wear when you didn't expect it.
So go find exactly what castor you used and check it on MB approved list.
Even the E500 V8 uses a chain to drive the oil pump. It looks like pulling the oil pan will give access to the pump. There is a chain tensioner and this might be your problem. It might be worn especially if your oil didn't meet the 229.5 specifications.
So given what I have learned from the MB manuals.
1) use 0w40 M1 European formual oil if it is available
2) Verify the noise change if it does?
3) Consider pulling the pan and replacing the oil pump/chain and tensioner.



