There is no 4.0 liter. The 92 400SE (swb) and 93 400SEL (lwb) were both 4.2 liters, same displacement as the later S420s. The 93 400SEL was the only long wheel base / letters in rear 4.2 liter 140 body but that motor was used throughout 140 body production from 92 to 99. It is one of the best MB engines ever made.