The folks at Mobil (and other oil companies) do not make it easy. Many hours of internet research has lead me to the following conclusions:
Variants of "Mobil 1" have poliferated and they do not all meet european (and especially MB) standards (that seems a bit missleading since they tout approvals by Porche, BMW, MB and etc.).
As I understand it (please correct me if you disagree) '03-'06 North American 2.7 liter Sprinter Turbo-Diesels can use MB 229.3, 229.5, 228.3 or 228.5. NOT 229.1
Some Mobil 1 variants only meet MB's 229.1 spec which is NOT RECOMENDED by MB for '06 model Sprinters in North America).
If a jug of Mobil 1 does not list the numerical MB spec it meets, assume it DOES NOT meat the spec you want (it may or may not meet the MB 229.1 spec that can be used outside North America).
REPEAT: Many Mobil 1 types are NOT OK for late-model North American Sprinters.
Mobil 1 s that DO list the proper specs are "Mobil 1 European Car Formula 0W-40" (meets 229.3) and "Mobil 1 Turbo-Diesel 0W-40" (meets MB 228.5).
Fortunately our WAL-MART stocks the Mobil 1 Turbo Diesel.
Other oils that meet the proper MB specs include (but are not limited to) Chevron DELO XLD 10W-40, Mobil DELVAC 1 5W-40 and Mobil DELVAC 1 SHC 5W-40.
I suspect that AMZOIL makes a lube to meet thr proper MB spec, but double check to see that it lists one of these: 228.3, 228.5, 229.3 or 229.5.
This seems way more complicated than it sould be; I have NO confidence that the guys at the auto stores or lube shops get it right. Hence my moto; If you want it done right, do it yourself!
By the way; this does not apply to the new '07 3.0 liter Turbo Diesel that needs a differant spec because of the particulate filter.