R129: Which 6 cylinders take (R or V) hand switch or automatic

Hello everybody, I want to add a SL from the model R129 in the near future Now I have no idea about the model, except that I like it super well Can you give me a page, which deals with the typical weak positions and where I can get more info about the SL from this series? What about engines. Of the driving performance would be enough for me the 6 cylinder. As far as I am informed at some point from R to V engines changed. Which engine would you like to Which one is more robust and durable, how does it look with consumption? What does it look like with a manual circuit? Do the what or yet automatic? Should you buy the R129 from a best, year of construction? Questions about questions… Thanks for the help