Dealer says don't use synthetic in tranny.
I'm about to service my '90 300 CE transmission and called the local MB Dealer to check on price. When I mentioned the cost for synthetic, the service advisor was adament about not using synthetic in my car. He stated that they only recommended it for late model MB's, I didn't get the specific years. My transmission currently has synthetic (from former owner). Which direction do I go? I'm going to change the TC fluid also.