I'm considering the purchase of a W124 estate and would like to know the pros and cons of the various 4 cylinder engines which were available. The 220 looks best on paper- 150 BHP, but perhaps there's more to it than that. Which is the most refined and easiest to work on. Are the 16 valve units better than the 12 valve, which gives the best MPG with an auto 'box? Any advice gratefully received.