some modern engines wont run on it but yours will on that year tyson. maybe mix it 50/50 with the cold weather coming. also change your fuel filter after a few hungred mile as the oil takes all the shit off your tank and fuel pipes.
Strongstuff i would look into it a little more before i put it into yours. as you say it would be an expencive fix
there is plenty info on the net if you google it it will give you all the info you need