I have a 2010 Ford Expedition with 121,000 miles on it. I recently noticed that on the Autobahn at around 50 km/h the transmission locks up until the car reaches 60 km/h at which point the lock stops. I took it to Aamco who said they would have to rebuild the transmission at a cost of $2600. After visiting several internet forums, I became aware of this product. I took the car to the local mechanic, he drained the gear oil and replaced it with full synthetic ATF and added 3 cans of Lubegard! The curtain is gone and the whole service only cost me $150 plus $18 for 3 cans of Lubegard. This product really works. I recommend this as a first step before rebuilding this transmission.