Following several years of testing, Valtra’s dual-fuel biogas/diesel system is almost ready for sale. The Finnish firm had one of its T133 tractors on display at Agritechnica kitted out with extra saddle tanks and a modified intake manifold to allow it to run on either straight diesel or a mix.

When running in biogas mode 17% diesel is required to ignite the biogas in the combustion chamber and when you’re out of gas it’ll just switch over to diesel.

Gas tank capacity is 170-litres which equates to between three and five hours work while the standard tanks will still carry 165-litres plus 27-litres of AdBlue to keep things clean at the stack.

Valtra says that when running on a mix the six cylinder engine is significantly more efficient than when running on straight gas or diesel. With more and more biogas plants popping up all over Europe, fuel costs are reckoned to be cut by 10%-40% and for those wanting to be totally self-sufficient, the engine will also run on 100% biodiesel.