Original Continental conti pro contact tires (245/40/18) for Mercedes Benz E350 with approx. 15,000 miles on them and my tire blew on highway. And side rim of tire has big cut.it was at the time of traffic at 5 pm and I was very close to hit sidewall of highway. Last week again I discovered that other two tires Continental contiprocontact on same car has a bubble on the sidewall. The bubble is within a quater to half of an inch to the rim. After a day one tire was flat and big cut I see at same place where bubble was. I called mercedez Benz as my car is still under warranty and I was told that it has happened because of pothole and you have to replace all the 4 tires. I only drive car for work and I never hit pothole it looks like there is manufacturing defect with tire. I am sorry to say that even car is under warranty Mercedes is not doing anything and there is no recall on tire. I have noticed many people complaining about bubble issue with the tire. Continental tire should be taking care of the tire as it only has 15K miles

- Franklin, WI, USA

I purchased a pre-certified 2015 Mercedes-Benz E350 4matic sport with 19,550 miles on 3/9/18. Within the first 175 miles driven I have experienced a flat tire from complete sidewall failure in one tire (which was a newer, non-original) and two sidewall bubbles on two of the other original tires. The sidewall failure was due to hitting a small pothole while the bubbles seem to have been caused by normal driving. The tires are contiprocontact 245/40R18 which seem to have common sidewall issues from the complaints. For safety concerns I have ordered Michelin Pilot sport A/S 3+, so will be out around $1,000 (plus the $255 cost of replacing the first blown contiprocontact, which has about 50 miles on it, but I do not feel safe driving on it).

- New Hope, PA, USA

I ran over an unavoidable moderate sized city street pot hole at low speed while braking and the front passenger side tire deflated. Another original tire was defective and developed a sidewall bubble in September and the dealer replaced it for free. Then I was instructed to inflate the tires to 40 psi and I have been careful to maintain the tire pressure.

- Atlanta, GA, USA