 All of these olds designed units were non-turbocharged (or natural-aspirated) diesels.This undoubtedly hampered them in the performance and efficiency departments, although there have been retrofits of turbochargers to Olds diesel blocks which are carried out by enthusiasts and collectors of these cars.It isn't well proven if turbos are reliable long-term with these engines, but so far they seem to be suitable, however, what performance benefit they bring could be considered as dubious given how low their power output was to begin with.