Howdy folks,
I've scoured this site and You Tube and can't find a video on how to do this. The several on You Tube I've found are on different engines. Anyone have a link?

 

While I don't have the GLC63, I run a GLC43, but what I've found is that with things like this, it follows the basics of the C-Class. So, changing out the air intake filters on the GLC63 should be the exact same thing as the C63 seeing that they are the exact same engine.
the only thing you'll need is a T20 (for my GLC43 it's a T20) and that's it. The filter lid holds onto the screws when you unscrew them, but be careful anyways. I also use a small handheld vacuum cleaner to suck out any debris in the airbox. Then, it's as simple as pulling out the old ones and putting in the new ones. May I suggest you check out FCPEuro for your filters...they have a money back guarantee. So when you need to replace them, send the filters back to them and they refund you your purchase price...all you pay for is return shipping. And if you use USPS, you can use a flat rate box...So, $10 to ship the air filters back to them!