_AMG_

I found an Independent oil test on 6speedonline. And Royal Purple oil came out on top. I think Im going to try some 10w-40 in my car.

http://www.animegame.com/cars/Oil%20Tests.pdf

Lemme know what you guys think.

vmx128

Wow, there is a HUGE difference between the performance of Mobil 1 and Royal Purple! I don't feel good about Mobil 1 anymore . Wonder if 10w40 will work in our engines.

andy_c63

They have 0w40 and 5w40 as well, but it is not approved by MB and I am not sure if this test is not biased.

tgoss

I used to use it in all my past turbo cars. Loved the stuff

But then again they were pretty highly modded and I changed the oil every 1500-2000 miles, so I'm sure anything synthetic would have done the job. They were expensive engines so I didn't want to risk anything.

With the AMG I just have them use Mobile 1.

e1000

Where's Glyn!!!!!!

In the meantime, let me rip into this article myself. Apparently, this article (and testing) was so bad that the original website pulled it, and published a follow up admitting to how bad the testing was.

NOTHING in this article proves anything about engine oil and how it performs within an engine. Engine parts don't undergo the type of loads that this test performed plain and simple. Furthermore, engine oils are designed to work at operating temperature, not necessarily room temperature. What about shear qualities? What about how the oil performs with the chemistry/operating temperatures of a particular engine? What about longevity?

If you're swayed by this article, by all means, go ahead and switch oils. Keep in mind though, there is no reason why MB or AMG would tell you to pour anything less than the best for your particular engine inside of it.

c32AMG-DTM

Disagree with your statement there. Of course there are reasons for them to select/recommend oils other than the absolute best-performing option. What if "the best" oil is 3x as expensive as other "good enough" oils? Think MB/AMG would still recommend "the best?"

MB/AMG approves of many motor oils - from what I understand, it's because those oil manufacturers pay MB/AMG to be tested and, if requirements are met, added to their "approved oils" list for the particular certification level passed. And, to get that little sticker inside the car, as well as being the factory fill provider, I'm sure Mobil pays more to MB/AMG than any other manufacturer. Is Mobil 1 bad? No. Is it good enough? In my opinion, yes. Is it the "best" oil? Probably not.

I would rephrase your comment as "change oils if you want, but keep in mind that there's no reason MB/AMG would recommend an oil that doesn't at least meet all of their minimum requirements for performance - so going to a better-but-more-expensive oil is likely just throwing away money."

My $0.02.

Mx_AMG

I also think that it has to do with politics, I mean MB endorses Mobil and by that they get certain amount of business because thats whats used in the car. If other oils are better then you think MB would also endorse them. I have heard for a while that Mobil has not been keeping up, I used mobil 1 in my 2000 turbo T/a and never had any issues

KLR CLS

FWIF I use royal purple in my 55 and it seems to love it.

87C63

Here in my city in sweden at MB they use Castrol SLX PRO LONG in C63.

e1000

I disagree. Yes it's true that oil companies must pay to have MB certify it's oils, we've seen that it's certainly possible given the number of oils that are approved for the different spec MB oil standards. Again, with modern engines, there are so many things to consider when it comes to engine oils I personally feel it's a pretty good idea to keep to MB specs.

I think we can all agree however, the article is garbage and the testing useless.

AMGC60-3

All MB and AMG powerplants are developed and tested using Mobil 1 motor oil and I am almost positive Porsche as well.

bhamg

Based on some things I've read in the BITOG forums RP is somewhat controversial for its add pack. I'd probably stay away from it not because it's not potentially a good oil in some applications but because IMO why take a chance on an oil that is not MB-approved when there are so many other really good oils that ARE approved? Personally, if/when I change from Mobil 1 I'd try one of the Motuls or the Pennzoil Ultra 5w-40 European Formula.

_AMG_

Can you elaborate as to why this test is "garbage"?

superlubricity

see post #5 and linked follow-up article.

Quadcammer

yup, that test is useless.

Mobil 1 is not the best oil out there, but what makes you think your engine needs the best?

if you use even a decent synthetic, treat the engine properly, and change the oil regularly, you are just fine.

Palladin

Abso-freaking-lutely they would. Have you checked the parts prices for AMG cars recently? This is the company that charges you $350.00 to replace a foglight lens. I think MB/AMG would be perfectly happy to charge $1000.00 for an oil change using Royal Purple Hyper-Space Warp 9000 Unobtanium technology if they could convince customers it was THE BEST OIL IN THE UNIVERSE. No doubt, as others have mentioned, Mobil 1 pays them an endorsement fee and gives them a good deal on the factory fill oil in return for that pretty little sticker under your hood, and it's probably good enough oil for the average customer.

mrobinso

I would disagree here again, I think that, as previously mentioned, MB has plenty of incentive to keep oil change prices low for its consumers and for the company itself on warranty work. I think that your argument would make more sense if MB recommended "only the best of the best" oil for its exotic level cars (for example, the SLR) where the high price of oil comes with the territory. However, with as big as Mercedes is and with as wide array of vehicles as Mercedes has, it is more efficient and economical for MB to utilize an oil that, as also previously mentions, meets the required specifications for MB engines, but perhaps is not the oil that farthest exceeds the required specifications.

c32AMG-DTM

Um, guys - quite a few "I disagree" statements, followed by comments that agree with what we're all saying.

Mobil 1 meets the minimum requirements for MB/AMG tests and, as such, complies with their 229.5 certification standard. Other oil manufacturers have submitted samples for analysis and certification and have also been approved for 229.5.

Two other 229.5-approved oils:

Total Quartz 9000 5w40 is what I've been using recently, since it was stocked by autohausaz and relatively cheap for the big jugs (w/ free shipping no less).

Motul X-cess 5w40 is also supposed to be an excellent, albeit expensive option... from what I gather, it uses higher quality base stocks than M1 uses.

M1 is not the "best" oil available on the market, and MB/AMG has a number of perfectly logical reasons for recommending an option that is inferior to the most technologically advanced motor oils available today. What M1 is: affordable, readily available, MB/AMG-approved... all of which makes it a safe bet in your Mercedes.

andy_c63

Motul 8100 X-cess 5W-40 IS NOT MB229.5, but MB229.3.

Motul 8100 X-max 5W-40 on the other hand is MB229.5.

KLR CLS

I think it's alittle strong to say the test was bad or false in anyway. It showed that with the falex test, used to measure extreme pressure film strength, certain oils performed certain ways. The follow up article just basically said everybody has a different way of testing and there is no real way to directly replicate oil performance in the engine.

For what it's worth Royal Purple is used in several thousand HP drag cars, and is probably one of the more commonly used oils in the north american racing scene. I have used it in all cars including CTS-V, RS 4 and S6, and my CLS and never felt better about it.

GHAZAN

listen to this guy

c32AMG-DTM

I believe that used to be true. AFAIK, your info is now dated. For reference to support my claim, a post made November 2010, from the Bob is the Oil Guy forum:

Here's the shortcut, if you're lazy like me :

http://www.motul-oil.co.uk/pdfs/synt...5W-40_(GB).pdf

andy_c63

Interesting, does MB know about that?

http://bevo.mercedes-benz.com/bevoli...nt_action=show

SebringSilver

I'd been staying away from MBWorld of late, but coming back now it's reassuring to know that if there's a thousand things that may have changed, the one constant is somewhere, somehow, there's bound to be an engine oil thread/discussion/argument on the C63 forum.

ZephyrAMG

It just feels cozy, like your back home from college, no Sebring?