okay gang -

I posted here a couple months ago about my wife's 97 E420 ticking on idle - you suggested I check the oil bridges, etc. According to the local dealerhip, this wasn't the problem - after they replaced 2 lifters and the problem continuing, they have decided that it must be the crankshaft hitting the lifters - they are recommending a new crankshaft and all new lifters - does this sound right?? This bill would be astro-freaking-nomical!!!