Blue devil was used on a 2003 4x4 transfer case with 200,000 miles on it. New synthetic oil had just been added for that mileage service and the rear seal started leaking almost instantly. Weird!
Puddling was small but very noticeable after the vehicle sat overnight. For a few weeks the driveway needed to be cleaned every day. Being a Toyota it was an 18 hour job according to the time rate book. The transmission shop, really not wanting to do it mainly because of how much it was going to cost me, suggested trying Blue Devil. After reading the instructions the proper amount was added and the recommended 100 mile round trip was driven. I thought maybe the synthetic oil, being new, was just too slick for the seal to hold and I didn’t have high hopes. It was a shocking miracle that there wasn’t another drop leaked. Oh, a question Are you using synthetic motor oil?
