Greetings members. I am hoping someone will be able to help me out with this annoying problem. I have a 2013 C300 4matic. Two years ago I installed new tires on the rear (General all season) after only 6,000 miles, they became cupped and were making lots of noise. I replaced them with Michelin tires (original equipment) and after only 8,000 miles the same thing is happening. I have a four wheel alignment done every year by the dealer, monitor the pressures regularly and keep them balanced. I love this car, but this is driving me crazy ! The constant noise really takes away the enjoyment of driving this car. I just turned up 100,000 miles and it has NOT always been like this. Help please