Gas engines pollute less? That is a subjective opinion. Diesels produce less CO2 but more particulates. Have you heard the latest that particulates slow global warning. Make your diesel soot with pride and who has a squeaky clean garage anyway.

There is no doubt that almost any petrol mercedes will out perform and be more fun to drive than a diesel with the exception of then the new cdi diesels. With modern diesels becoming more electronic driven you loose the simple mechanical elements of the old diesels. Larry's analysis sounds right. For longevity, long freeway commutes and do it yourselfers late 70's and early 80's diesels are a great bet. If you love instant acceleration or primarily drive on stop and go roads a gasser is probably for you.

Bottom line always buy a car based on your goals. I bought my 300SD to eat miles and use veggie. I have driven it for a year on diesel. However I am finally getting around to my veggie. Now I have read these groups I would probably be willing to buy a muscular mercedes gasser if fuel was cheap.

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory