Why it’s first: MO — Mercedes-Benz: Mercedes Original: developed with Mercedes for the model's weight, steering feel and noise — the casing and compound are matched to the car's suspension settings, so it drives as it was signed off. On a 4MATIC the mark keeps the axles' rolling circumference matched for the centre differential. The approved sets come before the rest.
Matched sets for your Mercedes CLS (2012)
255/40R18 front · 285/35R18 rear
Your car takes a wider tyre on the back, so these come as a set — the same make front and rear, priced for all four fitted. Pull the shelf along for more.
OE for your car first: the sets Mercedes approved for this car, the mark on the tyre wall says which. Then the rest, best grade first, no maker twice in a row.
Tap Compare on two sets to see them side by side, axle by axle

