I have some info for people who are riding the fence as to install or not.
I just called Subaru Of America and my local dealer, this is what I got:
S.O.A. If any aftermarket part that is not partnered with Subaru is installed then it could potentially be an issue in relation to a warranty claim. There is no data on their end for this item.
Local Service dept has some customers that have them installed and they don't discourage it, however, if there is any engine problem relating to lubrication it has the potential of being an issue for warranty. Why ? Because they can claim it leaked or something similar.
Yes, I know the chances of this happening are very low, but what if....???
I have one installed but am thinking about putting the original plug back on because my engine has developed a "tick" that is bugging the He++ out of me and I don't want them to look for any excuse to refuse my help.
I'm curious what y'all think about it ?
I'm not a doctor but in my internet medical opinion, you worry way too much.
I will patiently ask what the nexus is between an engine tick (assuming you have true one and not just the sounds the Boxer engine normally makes) and the drain plug?
To deny a warranty claim there must be a causative connection between the problem and the mod. There's none with the plug. It's a plug that has no personality or function other opening and closing every 6k miles.
I installed my Fumoto using the factory crush washer, torqued to 30 lbs. It's been on for nearly 44k miles, not a drip has leaked and the lift lever has never moved. I use the plastic clip and that's always in the same nested place.
The valve is solid and it will not cause a warranty issue.
As far as the warranty thing, here's a little quandry for SOA. On my 2016 LED lights for the overhead map lights weren't an option but they currently are. I replaced my bulbs with the ones I belive are on the new cars. Have I created a warranty concern or the possibility of one? Remember, the wiring is the same for all models and the LED lighting is an option aka plug and play.
Being concerned about warranty issues over a mod is normal but it has to be rationaly related. The plug is in no way related to a tick.