I have to assume that your ML is a recent purchase? Double blinking wrenches means that it's time to perform the "B" service to your vehicle. It will run you about $400 at a dealership.
FYI - Service intervals for this vehicle run on a (typically) 6-month rotation. "A" service is the smaller of the two, and it usually runs about $250. Then, 6 months later, it's time for "B" service.
Please check the stickies at the top of this post for pertinent information regarding the upkeep of your vehicle. Unless, of course, you are intentionally asking an easily-researched question as an April Fools prank, in which case I applaud your ruse. Well played, sir.