I purchased a 2009 Outlook XR AWD last June. 3 months and 4000 miles later, when driving around 40 mph, I started to notice the transmission shifting back and forth roughly between two gears until I sped up or slowed down. After reading around online I thought for sure this was the beginning of the 35R waveplate issue. I took the car to a GM dealer and they found the engine oil was nearly empty! They filled it up, said they didn't see any leaks, and charged me $150. They said it was normal to lose a quart or two every 2000 miles, which sounded like a lot to me. The shifting issue did go away after they added oil. I've been keeping an eye on the oil ever since. It looks good for the first 2000 miles or so after an oil change, but after that, it starts to drop pretty quickly. At 4000 miles the oil is barely on the dipstick. I don't smell anything burning and there are no signs of oil leaking on my garage floor. I checked the antifreeze tank and that looks normal. Where is the oil going? Whenever the oil starts to get low, the shifting issue shows up again. I just change the oil and filter and cross my fingers I make it to the next change. Any ideas what the problem could be? At this point I wish it was the 35R waveplate as I just got a letter in the mail yesterday about the extended coverage.