Chris: at 81 Kmi the car should be almost new and should not have needed eng/tranny mounts unless tampered with by an inexperienced mech - or I strongly recommend you locate a qualified dealership where they might find the fuel pump to be out-of-spec - a.k.a. a timing problem. This engine runs extremely smooth. Shut-off, likewise, is smooth/uneventful.
The CDI 648.961 engine is equipped with a sensitive diesel emissions system located on firewall. To safeguard it is imperative that you use Mobil 1 ESP Formula M 05-W40 MB-Approval (updated March 2017) 229.52. Repeat: Key words are ESP and 229.52!!