Comprehensive coverage for the Mercedes-Benz C300 costs an average of $1,948 per year ($162 per month). Motorists can find the cheapest Mercedes C300 insurance in the Premium Sedan trim level at $1,872 per year. The C300 4Matic Cabrio has the highest rate at $1,996 per year. Compared with the entire small luxury car segment, the C300 ranked ninth out of a total of 19 compared models. How much does Mercedes C300 insurance cost? The average cost of motor vehicle insurance for a Mercedes-Benz C300 is $1,948 per year with full coverage for the 2023 model year. Monthly coverage for the C300 ranges from $156 to $166, depending on the trim level of coverage. Breaking down the cost of individual policies, the collision damage waiver costs about $510 per year, third-party insurance (or PIP) is estimated at $546, and the rest of the collision coverage is about $892.