W209 55AMG 2003 Oils

[gwizdus]

Hello guys!
I've recently bought this car and would like to go trough with some of the oils to know what I have and be sure, not worrying.
I've heard some good stuff about Millers CSF 5w40/0w40. Personally never used Millers oil and would love to know your opinion as well. The recommend one that appeard on their website for this model is XF Longlife 0w40 but there is also a similar with nanotechnology. Would you say to give a go to other oils like those or stick to the original one? Also 0w40 was good for the new car, now it has 109k on the clock so should I stick with the 0 or go to 5?
The other thing is differential oil. But here I'm lost. Any specific one I should use or stick with the recommended.
I've tried use the search option but couldn't find the answers I'm looking for so either I'm dumb or there are no similar topic on the forum.
Gearbox was serviced 4y ago like oil and cleaning so I think I don't have to touch that it's not cheap
Thanks,
Konrad

 

[GordonTarling]

I was told that AMG only recommend Mobil 1 oil - whether this is true or not, I have yet to find out. However, my car has always had Mobil 1 0w40, so that what it gets. Sorry, I don't know about the diff oil.

 

[gwizdus]

I was told that AMG only recommend Mobil 1 oil - whether this is true or not, I have yet to find out. However, my car has always had Mobil 1 0w40, so that what it gets. Sorry, I don't know about the diff oil.

Oh well thanks for the response, it's the only one unfortunately but to be honest I can't find answers on any other forums so I guess Mobil1 wins. It's been used on most services at least that says the book with history I've got, there was Castrol once at some point but after that Mobil1 again.
Thanks