We stipulate that AMG series needs Castrol 0W-60 engine oil.

M278(V8 twin turbine) M275(V 12 twin turbine) needs oil from Jinmo Mobil 0W-40.

Everything else uses Mobil 5W-30, which is the data given by the manufacturer, and it is not up to the 4S shop to decide.

In fact, you can use 0W-40 if you like, but the viscosity of the oil will be a little different, which may cause the engine sound to be slightly louder than before.

What I want to say is that 5W-30 and 0W-40 oils will make you feel better when you look at the label, but there is no difference when they are actually used in engines.