My Cessna Cardinal started leaking oil. I had it checked and they found a crack about 3 - 4 inches long on the right side of the case below the front cylinder. I'm getting an estimate of $15k - $18k--remove the engine, strip it down, weld the case if they can (around $15k plus tax), otherwise replace the case (around $18k plus tax), reassemble and remount the engine. I'm choking on $20K with tax for a cracked case that will still leave me with a 1100 hour engine. The compressions are stellar and it runs well other than the crack. This is the Seattle area and everything is always more expensive but this sounds really high to me. Thoughts?