Took the 500 to my independent dealer in virginia beach va. today. They replaced the timing chain, rails, tensioner, and rockers. (10 of them were worn.) Also replaced spark plugs because they needed it. Total bill was $1300.00. The biggest expense was the rockers. I now have peace of mind that I can drive the car anywhere without worrying about the timing chain issue. Also, I have been trying to figure my mpg. How big is the fuel tank on the 85 500sel? Thanks guys for saving my baby from disaster! It really rides like a brand new automobile. I will be taking a road trip in the next month.