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The Michelin Sports are very good and grippy, but wear out in no time, the Conti's are harder wearing but noisy, the best compromise was some Dunlops (2000s I think) good grip and lasted for over 30000 miles on my 330d
Well its not like this car is going to need ZR tyres so any branded ones wil do the trick. Avoid P-Zeros on RWD as I found them crap on mine, Iam running Bridgestone SO-3s and love them.
For a 318 get Conti's or Pilots, car doesnt need expensive traction tyres.