I recently​ got a dvl 90..I noticed first off the tray seemed to be wore, and a oily substance...And when stopping the disc it continues​ to spin longer than I believe it should, is the grip wearing out or some other unforseen thing.

These players do have the rubber pad on the spindle. you can try taking the top off and cleaning the ring, also the loading belt might need cleaning/replacing.

The CLD-D704 grip ring will work as a replacement

Here's the link to order

http://www.pacparts.com/search.cfm?q=veb1237&x=0&y=0