u/UltraMaxApplePro

2013 L405 with the 5.0 SC engine, 86k miles. Just bought it, after doing an oil change with 0w20 liqui moly i saw this rusty or red coloured leak underneath the metal shield. upon taking it off im not sure what im seeing. It looks like a coolant leak but its extremely oily when you touch it, 0 smell of coolant or oil, its quite odorless actually. I was thinking the notorious vacuum pump leak but I can’t for the life of me understand what this copper grease looking stuff is. Is it someones attempt to stop the leak from the vacuum pump or is the leak something completely different? Wonder if any of you mechanics seen this before or can guess what it is. Thanks