Hi there...Please pardon my ignorance! I've owned my E350 for 2 1/2 yrs and have always had my local Mercedes dealer perform all the maintenance...until now. I'm now taking it to a local mechanic for the synthetic oil changes and other fluid replacement type services, but would like to try and perform some of the basic maintenance items myself. Does anyone know where to locate the Engine Air Filter in a 2006 E350? And also how to reset the indicator for Service D? Thanks for any help you can give!