If you read the manual, close to the back, it says you can run 100% biodiesel, with cars fitted with optional equipment, i asked my dealer, they never knew what is was, and where not very helpfull, my missus also has a
ibiza fr tdi 130 57 plate, that has same warning on piss flap about biodiesel, yet hers runs better on biodiesel.
I think why they tell you not to use bio, is because of the dpf filter, which is intended on filtering soot from your exhaust gasses, and as biodiesel reduces all emmisions by upto 90%, they think it will confuse the cars computer. i have been running on 50% bio with no problems at all, never had dpf light come on
Ps, car also made 193 bhp on dyno today standard
graph to prove, tried a tunit, only gained 7bhp so opted out and just fitted k and n panel filter
so should make 195 bhp not bad for an oil burner running on biodiesel
Further on with biodiesel, when tesco sold all that fuel that knackered peoples cars, they where not covered by manufactures warranty due to en standards on the fuels they bought or something.
My mate at seat also said, if you ever get any mechanical problems, just fill up with normal diesel, and no one would be any of the wiser. SO i dont think you would ever get a
problem
Also i ran a biodiesel business for 18 months, customer had the 5.0 v10 twin turbo diesel tourag, with dpf, ran 100% biodiesel, 40,000 miles, no problems
think its a grey area
I do like idea of saving £40+ everytime i fill up thou