Hmm. 2-3 turbos? That sucks. Do you know if any diagnostic testing was performed on the engine prior to the turbo swap attempts? If so, did the results show any signs of the engine being the problem? It's usually pretty obvious if the motor is causing oil consumption once you do a compression/leakdown test. Sometimes, however, a problem may be much more obscure and not as easy to detect.

I know we've personally had a single engine (out of the many that we've built) that consumed oil and everything checked out ok on the surface. We ended up tearing the motor down, inspecting, and rebuilding it to the same specs we use on all our other blocks and in the end the problem persisted. Our machine shop was out of ideas and we're currently brain storming on a possible solution. We will likely try swapping to a different shortblock entirely, but I'm not convinced that this will solve the problem either.

The kicker is that this is literally the only engine we've had this problem with and it's built and spec'd like all our other engines that don't burn a single drop of oil. It seems that sometimes you can run into a car/issue that is not as easy to fix as one might think.

The funny part about this is that I've seen built engines from other shops that have consumed at least this much oil or more and the customers are simply told that "built motors consume oil, it's supposed to do that" and are sent on their way. This kind of statement really gets to me as there is no good reason for a built engine to consume any more oil than a healthy stock engine. Admitting there's a problem is the first step to recovery .

-- Ed