Are Espace diesel engines biodiesel certified?
Don't think so, - which is why Anders's suggestion of running on a mixture is probably as far as I would go myself. (providing I could GET any bio-fuel legally)
However, I have friends running their diesel cars (including Espace's) on 100% farmer-produced rapeoil, and have been doing so for years.
Some of the biodiesels are even said to lubricate the fuel-path of the engine better than the fossil oil based diesel.
hmmm - Do we have any chemetry/fuel experts in this forum ?
/Lennart