I am trying to find photos/step by step or video of how to replace the air filter (not the cabin filter)....in my 2017 SLC300 (Don't see SLC in the list and SLC and SLK starting in 2017 combined I guess).....thanks in advance..first post on the forum. Assuming it takes two filters?

 

While the SLK 350 morphed into the SLC 300, the engines are completely different. The SLK 350 had a 302-hp, 3.5-liter V-6, and the SLK 55 AMG had a 415-hp V-8. The SLC 300 has a 241-hp 2.0L turbo-inline 4 while the SLC 43 has a 385-hp biturbo V6.

The engine air filter change procedure for your SLC 300 I4 should be the same (or very similar) to other Mercedes with that engine. There are YouTube vids that demonstrate the steps for various models and the ones I’ve seen make the change look pretty straightforward.

 

I don't have a video, but have changed it. Very easy. There is one filter element for the engine. Held in by 2 screws from the top (I think it is, as the opposite side is a leverage connection type. Unscrew the screws, loosen the hose clamp and undo the electrical connection.
Lift up, pull filter element out. Clean out area of leaves and such, replace. Reverse process to put back together.

It is the M274 engine, a few searches on line will help you with questions.