Both the SD and the wifes D are daily drivers. We both commute about 35 miles a day and as long as I keep up with the maintenance and service we NEVER have any problems. I have been driving diesels for about 12 years now and the only on the road problem I ever had was when I stupidly took off on a 250 mile trip with the SD the day I bought it. Realized after I got down off the mountain that the thing would not pull a hill or maintain highway speed. The car brought me home without problem even if I was down to about 5mph in the emergency lane of the interstate going back up the mountain. Turned out to be plugged primary fuel filter. My mistake for not checking and servicing a new{old} auto. Great automobiles!

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83 300SD- 223,000 miles {mine}
85 300D- 187,000, {wifes}
82 300D- 374,000, {parts car now, my first diesel}
74 Triumph Spitfire {constant PIA}
72 Jeep Commando {snow ride}