I recently bought the same low profile quick drain as John Smith mentioned in his posting.  I haven't installed it yet, waiting for my next oil change. 

 

When I built my IO-550 Legacy, I had to use longer than standard over-center links on the nose gear in order to get the correct angle of the nose gear when it was down and locked.  Justin, at Lancair's tech support at the time, told me I would be unable to use a quick drain because I would have reduced clearance.  So it's possible that what works on one installation might not work on every installation. 

 

I've changed oil a bunch of times without a quick drain, and I can't imagine that doing it that way is so bad as to justify removing the engine in order to install the angled oil drain fitting in your photo.  I was always careful when draining the oil, trying a variety of funnels, sometimes successfully and sometimes not. 

 

I once had a professional A&P help me drain the oil.  While I was explaining to him how I used a modified funnel, he pretty much ignored me and pulled the drain plug and just let the oil gush out all over everything, catching some of it in an open five gallon plastic bucket.  As you can imagine, it was a real mess, with oil all over the nose gear and on his hangar floor!  When he was done, he used an air powered engine cleaning gun like this one:

 

 

It mixes air from an air compressor with mineral spirits (paint thinner).  In about 30 seconds, he had the nose gear cleaner than before the oil change.  I've never repeated his techniqe since then, but I can't argue that it seemed to work without much effort.

 

Best,

Dennis

Legacy, 680 hours