Started in 76 as naturally aspirated and then switched to turbo version for the last 3 years of production. The 1980 model year was the bulk of the diesels right before they shut it down.Confirmed. SD33 and TD42 are one of its kind in-line 6 engines. First installed in american INTERLATIONAL HARVESTER SCOUT in numbers of 6500 units and NISSAN PATROL from 80's all over the world. Second in legendary NISSAN PATROL Y60 immortal engine