GM plans to trial biodiesel B30 with one of its key fleet customers using two van models, including the British-built Vivaro. The biodiesel B30-compatible models use the existing 2.0 CDTI Vivaro and 2.5 CDTI 100PS and 120PS Movano engines, and offer up to 20% fewer CO2 emissions on a 'source to wheels' basis compared to the standard Euro 4-compliant diesel units.