Actually, diesel fuel varies considerably more than gasoline. I would try them all and see what gives the best milage and the least smoke. I'm fond of the local Shell, but that won't necessarily be what you get a the Shell dealer near you (different source).

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!