I have a Benz C180 2000 model. I have been enjoying the ride until recently when I started having issues with it.

It started with hard starting in the morning, fan making noise. I visited an auto mechanic who changed the oil and oil filter, serviced the nozzle, changed the plugs and coils, changed the fan also.

After all these, I still experience high fuel consumption and makes a lot of noise when accelerating from a state of rest. While making the noise, it won't move well and drags. The fuel consumption is boring hole in my pocket. Please help.