Well thats really with any LS engine, they all really need a oil can.
As for the GM crossover your right they are all junk shit to me, but we have over 105,000 miles on it and havent had no big issues that weren't covered on the warrenty.
Get it, we have a 2010 Traverse LTZ thats my wifes and its been nothing but trouble. We are paying it off in about 2 years and trading it in on a new Yukon Denali>
Maybe, but it will cost you more. The stealership always does. I would google Tranny shops in your area and see what their reviews are and if they specialize in our kids of trannys.