brau, can I trouble you to post a picture of the back label of that 5W30 you referenced? If it's actually bearing the 229.5 spec that would be nice to know. All of the Mobil1 5W30 I've found does not.
that was incorrect information. I was trying to reference the actually conversation that took place for me to get this knowledge by memory. I looked up the thread for correct information it's 5w-40. If you read my story about it you'll understand how my memory failed me hahaha. I like this thread turned out to be an awsome read....
So what's the real deal here... - MBWorld.org Forums
on mbworld was the op of the following paragraph
Okay, I contacted ExxonMobil 1 and got an actual answer to just what is going on: while there is a Mobil 1 5w-40 Formula M specifically for gas engines, it is NOT available in retail form, other than Mercedes-Benz dealers. That makes sense since I have not been able to find anything on Google, the Mobil 1 website, nor have I seen it in stores.
"The Mobil1 Formula M 5W40 is a product Mobil makes for MB to meet 229.5
and only available from the dealer. Mobil1 0W40 is the retail product
that meets MB 229.5, either product can be used."
Note that ExxonMobil does not say that Mobil 1 5w-40 ESP Formula M (spec 229.51 / for diesel engines) is approved or can be used as spec 229.5, even though my dealer has stated otherwise.