gas

Hello, I have a 2011 Mercedes c300 gas with 115k miles And lately when I start it in the morning or when I start of after the car has been sitting for a couple of days it has smelly dark grey-ish smoke I wonder if there’s anything wrong??? Thanks in advance

I am a new and proud owner of my MB 500 SL. Does anyone know if the fuel requires an additive prior to winter storage? I was trying to find ethanol-free gas but there is none to be had within 200 miles of where I live. Thanks!

Had my car regassed at the end of last year maybe October time by a mobile specialist. He assured me that there were no leaks in the system. Gas lasted a few months when the car started hissing again I think in March/April on initial AC startup. So I called him back - he had put in the dye when...