I trust the tire manufacturer more.Are you using them in winter conditions?
Precise handling and good directional stability on winding roads, short wet braking distances and high mileagewww.barum-tyres.com
Per Barum they are summer tires. Per DT they are all season. I trust vendor more.
PS I looked at sidewall picture at the Barum site and I cannot find M&S or M+S markings anywhere. Do they have it?
M+S is pretty meaningless as an all-season tire. BF Goodrich G-force Comp Sport 2 is a summer tire that means the tread to void ratio to be M+S.
Also, since Barum is more of a european market brand, they are usually summer and winter tires. All-season tires in europe is not the same as all-season in the US. All-season in Europe means they have the 3PMS, like the All-weather tires in the US.