I ran 100:1 Amsoil for 2 years straight. Engine started acting up and I sent everything in,including my DA mufflers.
The mufflers were plugged with hard carbon build up so bad that DA recommended me buying new ones and I did.
Think about how little oil I was running and yet it had so much build up to clog the stock mufflers. I can't imagine running 50:1 Amsoil lol
		
		
	 
I bought a second hand omp edge 540 back in 2008.  I think the previous owner flew it for 4 or 5 years.  That dates the engine near 2003 or 2004.  It was a da-50.  Swung a Vess 23a.  Amsoil Saber at 100:1 for 5 years.  Same thing happened to me.  Here's what I did to fix my engine:
Switched to red line at 40:1
Took jug off to clean carbon from piston and ring lands, replaced the ring with new one from DA.
Cleaned muffler with dawn power dissolver about 3 times.  Could not believe the cap that came out.  Each time I rinsed the muffler from sitting overnight after taking toothbrush to it, it belched out a visceral black mess with chunks.  It did clean up well after 3rd soaking.
I also used the dawn power dissolver to clean piston.
Slapped her back together and went flying.  Tweaked engine tune for the first gallon of gas quite a bit.  The engine came alive, I swear it.  Before it felt sluggish from being restricted in the exhaust but after a year on redline that engine was running perfect.
It is now in an agtruk. 
 Still ticking away. I do believe I was the first one at our field running redline.  I remember taking a lot of flack for being a da and redline fanboi. Now I see more da's and redline oil at our field now.  Ain't that correct 
@Terryscustom ??
Eventually tried one of sullivan's canisters and that toned down the noise a bunch.  i really enjoyed this airplane.  sometimes i wish i still had it.
