My 2004 base mini had oil under it last night I'm willing to bet that it is the rear main seal has anybody changed these before do I need to replace my clutch at the same time my car drives just fine right now

 

Could it be an oil cooler line???

 

Check to see if it's coming off the Power Steering line, Once they go, "they go" if you know what i mean (it's right next to the exhaust, so that rubber tube get's beaten up).. you can soon tell, if you have oil forming/dripping from the "Shiney/clamp" looking part of the power steering pump, you know it's the line from the reservoir. Check the level in the reservoir...

 

So we put it on the lift today at work. It was pretty damp under there. With a flash light we think we found the source, the oil filter ring. I dont think its holding a good seal, it was puddled under the filter housing area. So we cleaned it all up, dryed it all off. Changed the oil, put new filter and ring. Drove the crap out of it so I could see if it leaks. Pulled it back in, racked it up. Reved it to 3k and let it run for 10 mins like that up in the air while I was under it with a flash light. No leaks. I think I fixed it. Lets hope. I brought pigmat home and put it under the car just incase.