I'm not new to diesels, but I am new to Mercedes diesels. I had a VW diesel for years but I'm moving up to the major leagues. I'm trying to determine whether I want to go with an '81-'85 5 cyl 300 or a post '85 6 cyl 300 model. Both seem to show significant longevity, and it may be very subjective but which is better? What is a reasonble expectation of mileage for the 5 cylinder vs. 6 cylinder? How much does the turbo add mileage wise. These are very basic questions for such a learned group, but I can't think of a better group to ask. Thanks for everyone's help. I live in Virginia and I am currently looking. Actually I am currently waiting for the current tornado warning to pass thanks to the remnants of Tropical Storm Cindy. Need to sign off before I get the inevitable call to go to work.