Although they still exist, 2-stroke diesel engines aren’t all that common, and 4-stroke engines are what you’ll commonly see around today. In 1998, Detroit Diesel announced it was dropping the 2-stroke diesel from its line and replacing it with a newer 4-stroke option, citing reduced emissions and improved fuel efficiency. This meant the Series 53, 71, 92 and 149 engines all halted production. Beginning with 1998 model year vehicles, a new law went into effect that restricted emissions from
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