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92 SC400, 218K on it. Run like a champ. New plugs, new oil, new filter for test.... 1. failed HC ppm on 15 mph roller test: 73 passing-129 measured! But it passed on the 25 mph roller 56 passing-50 measured. 2. Failed 25 mph NOx ppm 487 passing, 531 measured BUT passed on 15 mph 530 passing...