Actually, I didn't notice anything since I wasn't there to witness it first hand! What I did notice however, is that you claim to have had 2 front bearings go, on 2 different brands of engines, at approximately the same time. The only common factor being you, and the fuel. You can say that the GO Tech stayed running, but that wasn't the issue and doesn't take away from the point being made!

I assume from the way you correspond with Mark from Massive Mods, that you are local to him, and see him on a regular basis. I can only judge his fuel by what others have said, but I believe your opinion of it is somewhat bias.

I have over 4 gallons on my older version B5 and I don't think I've even seen the bearing leak. Which is a lot more than I can say for every GO or O.S. engine I've ever owned!

For all we know you could have poor maintenance habits like spraying Nitro cleaner behind your flywheel or worse, something like WD40, which through capillary action, will draw dirt and dust right through the bearing seals!

My point is, it's hard to blame the product when you've had 2 failures, on 2 different mills, at roughly the same time! Especially when there are so many other factors to consider!