stephenson:

I have not seen a more updated list so I guess the latest one still holds.

The MB dealers use Mobile 1 Tri-Synthetic 0W-40. I read an article somewhere that people were compaining that the 0W-40 was a bit too thin at operating temperature to protecting the engine so Mobile changes the formula a bit to thicken it up.

The Old Mobile 1 Tri-Synthetic 0W-40 (SJ) has a kinetic viscosity of 13.5 cSt at 100 deg C.

The new Mobile 1 Tri-Synthetic 0W-40 (SL) has a kinetic viscosity of 14.4 cSt at 100 deg C.

As you can see, it thickend up quite a bit at 100 deg C. By the way, the 40 deg C viscosity number increases as well. In other words, the new 0W-40 is thicker than the old one when cold.