1999...

I heard they fixed the problem in late 1998, see below.
I am sure DR. Diesel can put some input on it.

The rubber ring ( approx. 10-12mm wide ) near the circumference of the pulley is the problem. Prior to complete failure there is usually a noticable wobble of the pulley which can be seen with the engine running at idle.

"Group 3 - M112 & M113 crankshaft balancers that fail should be replaced with part number 112 035 08 00 or 112 035 09 00.

Improved balancers entered production as of engine end number 661775 for V6 and 166563 for V8."