Yes I let the car run for about 10 minutes before I left when it started happening. I also noticed a week ago when I checked my trans fluid "haven't checked it in about a month" that the first to pulls had blackish stuff on the rag then it went to a clear redish color "normal" then a few days after that I checked and it was redish. I had another friend who also owns a GP check his fluid and his first pull was black but not as much as mine was then back to normal color.