I had this PTU installed in my 2013 Edge about a year and a half ago at a local independent garage . The first ford OEM unit went out a 26K and was replaced under warranty. The second one went out around 105K and that's when I looked for an after market alternative. Like the reviews on Amazon and other sites, Dorman had installed the axle seal backwards and the unit leaked. The garage replaced the seals under warranty and I haven't had any more problems. I've put about 15K on the new PTU. Function and noise level are equivalent to the OEM PTU.
Dorman has a break in procedure they recommend when first installed and they suggest replacing the fluid after the first 500 miles and every 10,000 miles after that. A sheet came with the PTU that outlines their procedure and fluid change requirements. 10,000 mile fluid changes seem a little excessive, but if you want to keep the warranty intact you'll need to have records it was done. At least there's a drain plug to simplify the procedure.
No fluid changes were done on the two OEM PTU's that failed. I check with 2 dealers and 3-4 independent shops locally and nobody would change the fluid. They all said the same thing - lifetime fluid. Only one transmission shop said they tried on other edges and couldn't suction the fluid out - probably because it was already sludged up before they tried.
Except for the original leak I'm satisfied with the part so far. Hopefully it will last a long as the vehicle.
Rare