MB_Forever

Most dealers are lazy and don't keep everything up to date. They are probably just going by what's recommended by your manual, which is 0W-40. AMG stated that 5W-40 is now the recommended oil and have confirmed it through a TSB in May of 2008. So, if your dealer can't get Mobile 5W-40, you can always order it, and take it to them when changing oil next time. I think 0W-40 won't hurt either, but I'm just not sure why they issued the switch

Untertürkheim

Read post 27 and on.

ShanSL350

I had been reading the whole post and the reason i asked the question was that 05-40w was for everyone outside the USA but i had only called my dealer last week and they told me 0-40w.

I think as mentioned its probably lazyness on the dealers part, i will ask them to double check for me

Thanks
Shan

MRAMG1

Gentlemen:

Without going into great detail about oils, your engine or even a lab would have a VERY dificult time distinguishing between 0-40 and 5-40 weight synthetic oils. You will NOT do ANY damage to your engine or warrenty using either one here. The ONLY difference would be IF the oil SPEC was different, NOT weight, aka the additive package is what I am talking about here guys. My ex crew cheif worked for a research lab on oils, and I will gladly wager anything you like on this one. Oh well, read the label, and if they are the same spec whcih they should be, you will be just fine.

See yeah

PS: USE SEARCH ON THIS TOPIC PLEASE, as it has been discussed in GREAT depth on this site.

Untertürkheim

Like another poster said, as long as it is 229.5 approved, and -40 weight or higher, it is good for your car.

As far as I know, there are three oils that meet these requirements:https://mbworld.org/forums/3202814-post16.html

FactoryFast

I just got my report back from Blackstone Laboratories and the dealer is using 5w30 in my engine. When I asked my tech via text he said thats what they have on tap. Suggestions? Recommendations?

AA717driver

roadkillrob

My last 2 oil changes at the dealer have been 5w-40

Diabolis

Yes... two. (1) Show the idiots at the dealership that only 0W-40 and 5W-40 oils are allowed in the M156 motor and get them to flush that crap out of the engine ASAP (including the oil cooler) and replace with a proper 0W-40 or 5W-40 grade oil at their cost while you watch and make sure that they do it right, and furthermore get them to admit IN WRITING that they put in an unapproved thinner oil which may have already caused some damage and excessive wear to your motor so that if 5h!t happens and you're looking at $50K bill for an engine rebuild you at least have the possibility of a recourse. (2) Find another dealership or indie shop to service your car going forward.

Diabolis

Yup... Imperial oil now makes the MB oils again, but I too stick with off-the-shelf M1 0W-40 over the MB "energy-saving" concoction regardless of who makes it.

Valvestud

Here are the two pertinent specs that relate to the oils. The 223.2 spec drives you to which grades are allowed. The only grades for car in the US is 229.5, and you can use either 0W-40 or 5W-40 only. The 229.5 spec gives you the oils that MB has approved. There are many, many brands and types available in the 0W-40 and 5W-40 in the 229.5 spec.
I believe MB recently moved to an MB branded oil at the dealers, and it's unclear which brand. In any event, only 229.5 spec oil in 0W-40 or 5W-40 should be used.

Regards,

Joe

looney100

Diabolis

Precisely.

chrisridebike8

This! I went to MB Fresno because I was getting low on oil and just wanted a top off to hold me over a couple hundred miles before I changed the oil myself. The parts dept tried to sell me 5W-30. I had to ARGUE with the guy that I needed 5W-40. He kept telling me that all MB engines use 5W-30 now. I asked him to look it up and stated that our motors needed 5W-40 229.5 spec. Eventually he found out he was wrong. If I hadn't been informed, I would have put the wrong oil in! I will never take my car there and is a major reason I do a lot of maintenance myself or take it to a good indy shop when the job is too time consuming or too complicated for me to do.