Where do you add transmission fluid on a 2006 Mercedes C280?

Hi Guys, I believed your transmssion is Type 722.6 couple with M112 engine. you need to unplug the sealled filler cap ( with red plastic lock)located at end of right bank cylinder head. Personally i strongly recommend you to replace the trans. filter ,oil pan gasket & electrical plug at one go if you have hit 60,000km draining interval. you may opt to use ATF 3353 or premium grade shell ATF 134 for better thermalload handling. please don't forget to buy a new seal fiiller plug to seal off filler tube. thank , mercedes guy. Hi Guys, I believed your transmssion is Type 722.6 couple with M112 engine. you need to unplug the sealled filler cap ( with red plastic lock)located at end of right bank cylinder head. Personally i strongly recommend you to replace the trans. filter ,oil pan gasket & electrical plug at one go if you have hit 60,000km draining interval. you may opt to use ATF 3353 or premium grade shell ATF 134 for better thermalload handling. please don't forget to buy a new seal fiiller plug to seal off filler tube. thank , mercedes guy.