Major Issues to FIX

[Bmwtvboy]

I noticed an oil leak, looks like it's from the rear main seal. It's cool, 01,X5,3.0,254K miles. Is there any product I can use to slow or seal from the inside? Oil gasket sealers you recommend? To big a job n expense to tear into. Is the fuel filter regulator on this March 2000 production the press on fuel line or old style ?
Noticed some small drops of oil/fluid on a few bolt heads on the transmission pan, what or where are these from? Ideas?
Working on repairing ABS sensors with wheel spin test, I have no reader.
Replacing plugs, they looked normal, cona ring and light toasted grey prongs. NO oil in plug holes.
Thanks for ideas on the oil leak.