New Ford owner - purchased 2012 Edge SEL AWD in May - currently 50,000 miles. Wife has noticed (and I confirmed) a slight methyl mercaptan odor in the passenger compartment that came & went periodically. Checked for engine leaks - none. Talked with local Ford technicians & they had never heard of this problem.
Saturday, wife complained of unusual noise coming from the drive assembly. Took to our mechanic who took for test drive. He came back with smoke pouring out from under vehicle. When he placed it on the lift, he saw that the transfer case had broken off from the engine/transmission and that fluid had leaked onto the exhaust. He is recommending that transmission get replaced as well as the transfer case.
Towed to local Ford garage & hoping that it is covered under Ford's 60,000 mile drivetrain warranty.
Mechanic said the mercaptan smell came from transmission fluid dripping on exhaust.
