I had only one surprise when I purchased my engine from Keith. His 24 months/24K mile warranty does NOT cover Main Rear Seal Leaks! You discover this when the engine is delivered after you read the FINE PRINT on the Warranty. It's not surprising Keith didn't mention this when he talked about the Warranty in this thread!
Anyhow, my engine leaked like a sieve from day one. The only advise I got was to add a "thickener" to the
oil to try to plug the leak. As you can imagine, it never worked and I had to spend my own money to ultimately fix it which wasn't cheap. You should not have to go through this when you shell out $25K on a brand new engine! This was very disappointing!
I suspect this problem occurs quite a bit...otherwise there would not be a special Warranty exemption. So buyer beware...