Original 1973 Ford Dealer, Oil & Lubrication Guide. This guide was used by the dealership lubrication tech to know what to use while properly servicing Ford, Lincoln & Mercury vehicles. It's a wealth of information that is NOT included in the factory service manual. As far as I can tell all Ford-produced vehicles from 1973 are covered in this manual and some earlier years as well. Also, these manuals have never been reproduced and they are not that easy to come by!