It was a Renault TD
I believe the first year AMC offered this option was 1985. It was a 4 cylinder, 2. 1L (126ci) turbo diesel made by Renault. It made 85HP @3250 RPM and 132 lb-ft of torque at 3000 RPM. The block and head were cast aluminum, and it used a Bosch injection system. compression was 21. 5:1. The last year offered was 1987. I have never seen one in real life...
Brian Z. Oo.