Im sure this has been covered here numerous time's, but i just want to know what you guys run.
I have a 2008 C230, 2.5 automatic 4matic, with 320,000 kilometers.
5w30 Synthetic i guess?

Anyone?

Any on this list are good:

https://bevo.mercedes-benz.com/bevolisten/229.5_en.html

As for which weight, it's more about your climate. If it doesn't get very cold, then 5w30 is fine and some people report slightly improved gas mileage with the lighter oil as compared to a 0w-40 or 5w-40.

I buy synthetic oil from dealer supplied by Mercedes, grey 5L cans 229.5 Spec with stickers from germany, but yet to find out for sure what it actually is. It seems it may be 5W/40. Not sure if this oil is refurbished or original.
https://bevo.mercedes-benz.com/bevol..._en.html#close

Also see:229.5
https://bevo.mercedes-benz.com/bevol..._Motoroel.html
Then see:223.2
https://bevo.mercedes-benz.com/d/d/de/Spec_223_2.pdf
---------------------Notes 2 & 5
2.) Einschränkung: Es dürfen nur Motorenöle SAE 0W-40 und SAE 5W-40 verwendet werden!
2.) Restriction: Only engine oils SAE 0W-40 and SAE 5W-40 may be used!
-----------------------------
5.) empfohlen für niedrigstmöglichen Kraftstoffverbrauch (jeweils niedrigste SAE-Viskositätsklasse; mögliche Einschränkungen der freigegebenen SAE-Viskositätsklassen beachten)
5.) recommended for lowest possible fuel consumption (lowest SAE viscosity class, observe possible restrictions of the approved SAE viscosity classes)

BTW, with 320,000KM on the odometer, have you by chance signed up for your 250,000KM High Milage Award?

https://www.mbusa.com/mercedes/herit...unity/overview

I didn't know that was a thing.

You should try and get it, don’t forget to come back and share a pic!

0W40