Oil filter change
Mercedes is the world's best engineered car, and the oil filter capacity is just fine for recommended oil change intervals.
But, it does less harm than changing all the oil early.

The engine runs some time without proper oil pressure after each oil change but I've understood that this is less of an issue compared to the issue with additives.
But please do not listen to me or others who don't know hard facts (lkchris may well know), read posts and evidence from the real experts, you can find several threads from this W211 forum.
I don't see how you reach this conclusion. What harm - other than the waste of money - could be done?
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If you want to change your oil early then go ahead and do it!.If you want to change when Mercedes engineers claim you should do, then do it.
But if you want data. Try this.
I think you will note that Mobile 1 has more wear in the 1st 3000 miles than the remaining 11000 or so miles. Just check the data.
http://neptune.spacebears.com/cars/s.../oil-life.html
For me I change when the FSS states it is time. At 85,000 miles using only Mobile 1 0w40 European formula and MB fleece filters my car still does not require adding oil between 13,000 mile changes and still drives like a new car. But if you really want to change oil at 6000 feel free to do so.
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Your mek-a-nics were right 20 years ago. Today--in the 21st century--they are wrong.
And there is indeed something wrong about changing oil every 3K miles--it's bad for your engine.
Please try to resist bringing "smallblock" or "mouse motor" knowledge to your Mercedes experience. It's 100% irrelevant.
Read and learn
http://forums.tdiclub.com/showpost.p...8&postcount=15
Your mek-a-nics were right 20 years ago. Today--in the 21st century--they are wrong.
And there is indeed something wrong about changing oil every 3K miles--it's bad for your engine.
Please try to resist bringing "smallblock" or "mouse motor" knowledge to your Mercedes experience. It's 100% irrelevant.
Read and learn
http://forums.tdiclub.com/showpost.p...8&postcount=15
Interesting post. It aligns with the link I posted. Both claim increased wear in the first 3000 to 5000 miles and the wear decreases as the oil is run longer.
Your mek-a-nics were right 20 years ago. Today--in the 21st century--they are wrong.
And there is indeed something wrong about changing oil every 3K miles--it's bad for your engine.
Please try to resist bringing "smallblock" or "mouse motor" knowledge to your Mercedes experience. It's 100% irrelevant.
Read and learn
http://forums.tdiclub.com/showpost.p...8&postcount=15
Don't worry though, I have written to Mobil. Perhaps we'll have an answer we can believe.
Last edited by Jen_Kenne; Jul 28, 2009 at 11:53 AM.
Q: Is there any evidence that changing oil soon than the manufacturer of the car causes increased wear?
A: No, that should be fine.
Q: Could you please elaborate on your answer? Perhaps there is a technical paper on the topic of early oil changes?
A: No, their is not technical paper that is approved by the API on this subject and that is accepted. ExxonMobil does not believe for any reason performing quicker oil changes on an automobiles will cause increased wear in any way.
-MJ
To me independent test data is much more relevant than data from a manufacturer (can't really even call what ExxonMobil provided data), especially independent test data from multiple sources. ExxonMobil is in business to sell oil...of course they're going to be fine selling twice as much to you.
I also take issue with this statement you made - "These long service intervals are due to federal regulations and cost calculations, not on sound engineering." Where did you get this information? If it were the case, why would a 13k service interval only apply to Mercedes Benz? Do the Feds have different standards for German manufacturers? Cost calculations...for who? The owner? Mercedes makes more money if we change our oil on a more frequent basis since that would mean more service visits. I'm raising the flag on this one.

Me, I'm going to go by the manufacturer recommended interval which (so far) seems to be backed by independent testing.
Q: Is there any evidence that changing oil soon than the manufacturer of the car causes increased wear?
A: No, that should be fine.
Q: Could you please elaborate on your answer? Perhaps there is a technical paper on the topic of early oil changes?
A: No, their is not technical paper that is approved by the API on this subject and that is accepted. ExxonMobil does not believe for any reason performing quicker oil changes on an automobiles will cause increased wear in any way.
-MJ
A member on another forum I'm on has had UOAs done at 10-12k miles for his Chrysler minivan which has run on Mobil 1 0W-40 for most of its life found that the 10k interval for that engine (which wasn't even designed and engineered to run specifically on synthetic) was more than acceptable.
I'm not sure what advantage you would have with this approach. The filter catches the larger particulate matter. Smaller particulate matter, acids, combustion by-products, etc. are in suspension in the oil.
I like McLeantmw's approach - change oil and filters every five or six thousand miles. These long service intervals are due to federal regulations and cost calculations, not on sound engineering.
Here's some info from someone with whom I have had personal experience. Although it's Porsche-centric, it's still a worthwhile read (and also someone who can do your UOA for you) He is a Northwestern grad engineer and well-known in Porsche motorsports. (LN Engineering mfgs custom cylinders, rods, and pistons all in-house.)
Click on "lubricants." http://www.lnengineering.com/index.html
Failure to use the right oil, use proper filtration, or observe proper changing intervals can affect the performance of even the best motor oil. This also includes changing the oil too often (needlessly bad for the environment and your wallet) or not often enough. Against conventional wisdom, engine wear decreases as oil ages to a certain extent, which means that changing your oil more frequently actually causes engine wear; these findings were substantiated by studies conducted by the auto manufacturers and petroleum companies, leading to drain intervals increased from 3,000mi/3 months to 5,000-7,500mi/6 months in most domestic vehicles, using mostly non-synthetic oils. Based off of extremely long drain intervals recommended by most European manufacturers, some in excess of two years and 20,000 mi, some users have found it best to reduce those intervals by half or even a quarter. Porsche for the 2008MY has reduced their extended drain intervals significantly to one year/12,000 mi, which is actually less miles than Porsche recommended back in the 1990s with 964 and 993 based aircooled 911s. Based on UOAs provided to us by our customers, new Porsche owners should consider reducing their drain intervals further to no more than 9,000 mi or one year and some shops recommend changes every 5,000-6,000 mi or six months.
Anyway, YMMV.
No pun intended.
Here's some info from someone with whom I have had personal experience. Although it's Porsche-centric, it's still a worthwhile read (and also someone who can do your UOA for you) He is a Northwestern grad engineer and well-known in Porsche motorsports. (LN Engineering mfgs custom cylinders, rods, and pistons all in-house.)
Click on "lubricants." http://www.lnengineering.com/index.html
Failure to use the right oil, use proper filtration, or observe proper changing intervals can affect the performance of even the best motor oil. This also includes changing the oil too often (needlessly bad for the environment and your wallet) or not often enough. Against conventional wisdom, engine wear decreases as oil ages to a certain extent, which means that changing your oil more frequently actually causes engine wear; these findings were substantiated by studies conducted by the auto manufacturers and petroleum companies, leading to drain intervals increased from 3,000mi/3 months to 5,000-7,500mi/6 months in most domestic vehicles, using mostly non-synthetic oils. Based off of extremely long drain intervals recommended by most European manufacturers, some in excess of two years and 20,000 mi, some users have found it best to reduce those intervals by half or even a quarter. Porsche for the 2008MY has reduced their extended drain intervals significantly to one year/12,000 mi, which is actually less miles than Porsche recommended back in the 1990s with 964 and 993 based aircooled 911s. Based on UOAs provided to us by our customers, new Porsche owners should consider reducing their drain intervals further to no more than 9,000 mi or one year and some shops recommend changes every 5,000-6,000 mi or six months.
Anyway, YMMV.
No pun intended.

btw, he has the VOA of most oils (and will provide you with yours free of charge if he doesn't have it on hand.) You can't use the info from a UOA without having the VOA as your reference.
For those interested, yet don't want to read through the somewhat lengthy info, here's the gist of it (and with the caveat that he is a Porsche specialist, not a MB/AMG expert) But understand that auto mfgs don't know exactly how you might be driving/using your car. Note that MB does use 'recommend' when it addresses oil and drain intervals. And always bear in mind certain guidelines while under warranty.
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Vehicles with track time or sustained high oil temperatures or RPMs should have their oil changed after every event (or every other event). This translates to a total of about 10 hours max, with vehicles with 12 qt or higher oil capacities- engines with smaller capacities must be changed more often. Vehicles subjected to very short drives or sustained operation in heavy traffic should indeed be serviced more often. Likewise, vehicles not driven often but driven hard a few times a year can probably go a year between oil changes.
Regular used oil analysis is the best way to determine ideal drain intervals for your driving habits - one good rule of thumb I have seen quoted is to change the oil with the TBN (total base number) is reduced by 50% of the original total (requiring you to also know your oil's virgin TBN).
Another common recommendation is to change the oil once it's TAN (total acid number) equals the TBN. Other factors to consider are fuel dilution and shearing out of grade when determining your drain interval. With this knowledge in hand, using a quality motor oil with proper filtration and regular service is the best thing to do for your engine and to protect your investment.
Used oil analysis is a valuable part of determining proper drain intervals and keeping an eye on the overall health of your engine. I now exclusively use Staveley Services North America for my VOA (virgin oil analysis) and UOA (used oil analysis) testing. Once you have a VOA for a baseline of the oil you are using, a good rule of thumb for determining your drain interval is to change the oil when the TBN has been reduced to 50% of the original amount, unless testing deems an oil change is required earlier.
This is more conservative than other recommendations to change the oil when the TBN is as low as 1 or 2. This means you should do a VOA of the oil you are using and you should order your oil tests with the optional TBN analysis to make that determination. If also testing for the TAN (Total Acid Number), when the TBN equals the TAN, then that is also an indicator that your oil needs to be changed.
In most cases, changing the oil at about half the recommended drain interval is a safe recommendation of how often your oil should be changed. In some cases, a manufacturers severe drain interval is exactly this, half the normal drain interval.
If switching labs, it is always good to have a control sample with results from each lab, from the same bottle, as not always can you compare results from different labs.








