If you’ve ever discovered a small amount white or yellowish compound around wiring connectors and butt connectors on your Mercedes when changing things like headlight bulbs or turn signal bulbs or other under the hood components, I believe you’ll find that was dielectric grease applied at the factory when the car was built. And it has simply turned color over the years due to age and drying out. Here’s the article by many considered to be the ultimate word on “greases” for electrical connections Dielectric Grease vs Conductive Grease