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I do have one on the wifes Subaru and it is nice.
Ordered one for the Sprinter van but did NOT put it in because the threads were an awful lot shorter than the stock plug, roughly 1/2 the length of the plugs threads, made me uncomfortable.
On the Jetta TDI the threads were longer than stock and it was obvious that the valve would dam oil in the pan, yes it was a small amount but the valve still would not allow a complete drain.
Now, with regard to the Powerstroke, could someone tell me how the thread length of the valve compares to the pan plug?
Having these valves makes an awful lot of sense to me and the installation has been approved by many car makers, Subaru for one. I wouldn't worry about failure, millions are in use world wide, and so long as the valve nipple, if you get that model, does not extend below any steel framing you have no worries, in fact I cannot see how it would be a problem even if the nipple extended somewhat below any framing-except on vehicles seeing extreme offroad use, and even then, the pan and various other critical parts would take hits anyway.
I am of the opinion that having the valve is more reliable than taking out the plug on a routine basis (for those who do not use a torque wrench), when everything else seems proper the only concern I have is not being able to use a torque wrench on the valve and not having a torque value for the valve.
They make changing oil alot easier.