On our way to the mountains when I noticed smoke coming fron under the car. Checked the engine & no apparnt leaks but thought I saw something way in the back, moved the the car, saw a bit of oil that would have fallen midway back. Fearing the worst, drove back to denver waiting for a big noise. It never happened. Took the car straight to the MB Clinic & it was quickly diagnosed as a sensor on the transmission. In & out in about 1/2 hour & it was covered by a warranty. Great going guys. Thank you.