What do you mean user related? Until it happens to you huh! I was a VP supporter but with the only 6 engines going south in 6 months between 3 of the most exp guys in the area who have got 8+ gal out of their engines in the past all Novas and same engines having rear bearing issues after a 1/2 gal - 2 gal of the same batch of fuel its got to be a lubrication issue so I would bet the farm on it! I am so sure now that I am not even going to send a new engine back to the distributer and bite the bullet spend my money again to fix it myself!