I would like to replace the whole engine but at this point I am thinking of replacing the pistons and rebuild the head. I just keep kicking myself with the chain tensioner. I just relized that I should of resent the damn tensioner and could not for the life of me see how to reset it so I thought puting it back with the same chain and tensioner would be fine. I was dead wrong. Now looking at bottom end and top end. Just alot of information to consider. My hesitation with a used engine is that how do I really know how many miles are on it?? A rebuild engine is approx 4,000 and the car is 91 300te with 188,000 miles. Car at best would be worth 6,000 due to it being a 4matic. Car body and interior looks like it has 50,000 miles on it. Any ideas would be great!!! DOES ANYONE HAVE A PICTURE OF WHAT A GOOD PISTON ON A (91 300 TE 4matic wagon LOOK LIKES GREATLY APPRECEIATED