Has anybody mentioned the reason this has happened yet? It would be awfull to buy new parts only for the same to happen again. In the wrong hands even the most proffesional work can be ruined in 12 years and 11,000 miles, assuming that is the true mileage. If muscrat is right about used, and previously siezed pistons being used in freshly bored cylinders then I would start investigating further into the engine. I'd start by looking for job numbers etched into the casings, phone S.R.M. and they will tell you what was done. Hopefully they will confirm the sludge trap was cleaned etc etc. The washed out theory might be right, but were those pistons in those barrells when it happened? Or were they used because they were better than the origionals which could have been destroyed? People do stupid things, and will then pull awfull stunts to recoup their money. I know a really top class mechanic who fitted a wooden piston made from a old table leg into a car just to get it running on 4 cylinders, to get it through an auction for somebody. He did it because he could and he thought it was funny. It worked, but what the new owner made of it we will never know.