I just replaced the valve stem seals on my 115 and adjusted the valves. But when I started her up, she really belched some smoke. I haven't run it more than five minutes since completing the job. Did I mess up?

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1987 300TD; 166,000 mi/267151 Km - had to make room for the dog
1973 220D; mileage ??????
1978 300D; 178,000