The L (2,387 cc) straight-5 version is based on the 124 PS (91 kW; 122 hp) 5 cylinder TD engine as used in the Mk1 Fiat Marea and the Mk1 Lancia Kappa. The JTD version benefits from the solid build of the TD block, and an improved head/injection system. There are 2 versions of the JTD, the 10-valve as used in the Fiat Marea 130 JTD and the earlier Alfa Romeo 156 / Lancia Lybra diesels where it was available as 136 PS (100 kW; 134 hp), 140 PS (103 kW; 138 hp), 150 PS (110 kW; 148 hp) and later a Multijet 20-valve version 175 PS (129 kW; 173 hp) as used in the later (2003>) Alfa Romeo 156 as well as some Lancia vehicles.
Several types of Biodiesel were tested, including Biodiesel derived from another oil crop, winter rapeseed. Rapeseed is grown extensively in Idaho, Canada and Europe to produce Canola. Biodiesel made from Canola has very similar properties to the Biodiesel made from soybean and other plant oils. In the Idaho study, the Biodiesel test fuels were (100%) rapeseed ethyl esters (REE), rapeseed methyl esters (RME), 50% blends of REE or RME, and 20% blends of REE or RME with petrodiesel. The reference fuel was conventional (Texas) No. 2 petrodiesel ("2D"), a low-sulfur diesel formulation mandated nationally by the EPA since 1993 .