I’ll try this again. Posted it about a year ago with no real answer. Is there a video on YouTube or whatever that shows the procedure involved in changing the spark plugs (that require changing at least twice as often as any vehicle currently produced). “Indexing” the spark plugs is unique. I know you can take it to a Mercedes dealer and pay $300.00 to change 4 spark plugs, but It’s just a spark plug change and there are how to videos on EVERY vehicle out except the Metris. Starts to make me wonder why.