15K miles the fuel filter issue, not a big deal but at just 21K miles (exactly 2 yrs old) and the cylinder head needs replacement. I leased this vehicle and will not be buying it as planned.

The engine blew at 26,000 miles. The bearings let loose. After seeing reviews online with other owners with the same motor, they’re all reporting a knock in the engine which is how this one started. Buyer beware if this car does not have a V6. The motor is too small to pull the weight or the company is cost cutting on the parts to operate the engine for its application I believe The lightweight four-cylinder motor is a way for Mercedes to save costs. However, the costs are transferred to the owner with a four-cylinder and repairs down the road. Most companies seem to be moving towards four cylinders in these larger cars and dependability down the road is the cost

I love my GLB but two months and ten days, after the purchase, the engine needed a repair which was covered by the warranty. However, we were planning a lengthy trip and was thankful this did not occur while we were a few thousand miles from home. Me and My Mercedes are still trying to figure our communication out. I prefer Waz or Google Maps to their GPS system. Advance notifications of turns and such are better. Other than these issues I love driving her, Gilby.