I've had one in my '13 Outback since I did the first oil change. Absolutely love it. As I see it, here are the pros and cons.
Pros:
So much cleaner of an oil change. My Fumoto valve has a hose barb on the end, so I can put a hose on it, and drain the used oil directly into the container that I will take to Autozone for recycle. I can do an oil change without a single drip of oil.
No tools, almost. No wrench. No torque wrench. The only tool I need for an oil change is a funnel to pour in the fresh oil.
Easy to take a sample for UOA. As others have mentioned, open the valve and drain for a few seconds, close the valve, put the sample bottle under the hose and open the valve back up. Super easy. And no mess.
No dropping the drain plug in the oil drain pan. No fishing for it with a magnet.
No replacing the gasket on the drain plug.
No risk of thread damage with each repeated installation of the drain plug. Others have asked how common it is to cross thread a drain plug. It's never happened to me, but I've worked on cars for friends and family that have oversized drain plugs, or repaired threads in the oil pan. So yea, it's a real thing.
Cons:
They aren't well suited for all cars. Take a look at clearance on your car. It works very well on my Outback. If something ever hit my Fumoto valve, I probably have a lot of other damage to worry about besides the valve. But there are other cars where a Fumoto valve would be one of the lowest points under the car. That is at least partly why I don't have one on the E350.
Drain time slower. Not a real issue. So now it takes two minutes to drain five quarts instead of one minute? After starting the oil draining, I change the oil filter. By the time I've got a new oil filter on, there is nary a drip of oil coming out of the valve.
Not all the oil drains out, because the rim of the Fumoto valve is higher than the bottom of the drain. Anyone who uses this as a reason for not getting a Fumoto valve is either looking for an excuse or hasn't taken the time to think it out. All the oil in an engine NEVER comes out during an oil change. Every engine that I am aware of retains somewhere between one to two quarts within the oil pump, the lines to the filter, etc. For example, my Outback requires 5.1 quarts when changing oil and filter. But it takes 6.0 quarts if it were overhauled.
