Bought my 2009 C300 from Ogilvie Mercedes Benz, before the delivery the car sale person already forgot who I was. On delivery, there were condensation in the side marker located on the rear view mirror of the driver side. Instead of offering to fix the problem, the sale person simply recommended to leave the side marker on to burn off the the condensation. I had to contact Mercedes Canada for the dealer to fix the problem!

For the first four years, while the car was still under warranty, all was OK apart from the regular maintenance there were only problems with folding mirrors and cracking leather seat. Which all was fixed under warranty at no cost. Problems starts 6 months after the warranty expired:
1) O2 sensor failed (cost: $600)
2) Steeling wheel column adjuster handle broke (cost $800 since the whole steeling wheel column controls needs to be replaced)
3) Blower fan making squeaking noise. (cost: $600 to replace the blower)
4) Check engine light about Engine not running at optimal temperature. (cost: $500 to replace the thermostat)
5) Sunroof will not automatic close. (Estimate: $200 to reprogram/re-sync the sunroof.

When the O2 sensor failed, the car was put into limp mode. So only three cylinders were firing. Took the car to Star Motor, it took them three days before looking at the car! In addition, it took them two more days to install the O2 sensor because when they order the O2 sensor they forgot to order the gasket needed for the sensor! During all this, they refuse to give a loaner stating that I do not have an appointment!

Recently, I have traded the Benz for another brand! I loved my C300 when everything is working, however there is always the worry of about what will fail next and how much that going to cost!