But we were told we could have the engine, right up tot he point of handing over the money. It is one of the conditions of why i got the repair done by them. On the reciept it says nothing about warranty claims. Just that it is a goodwill gesture. And since i have paid for part of the new engine, why can't I get the old one back? At least 50% of it is still mine if they are playing the warranty card. If the sludge was caused by the delayed service all those years ago, wouldn't it have been at it's peak then? Shouldn't subsequent oil changes help the problem, not make it worse? Thanks for the info on reusing the parts.