In 1996 E-series was introduced and Sisu's got again new model codes. The number following the letter E was now for the engine displacement in litres. After this was letter M followed by the engine output in horsepower. The M was substituted by gap when the Renault cabin was introduced in 1997. Confusingly, the model was written differently on the badge; for example on E18 630 the model is written as 18 E 630. The 2005 introduced last model with Renault cabins got extra trade names although the official model code was still with E. C500 was used with models powered by Caterpillar and R500 with Renault engine. Also application specific trade names were taken to use: logging vehicle became Sisu Timber, earthmover Sisu Rock, hook loader Sisu Roll, road maintenance vehicle was named Sisu Works, mobile crane Sisu Crane respectively and wheeled vehicle transporter Sisu Carrier.