Hi having read all the replies I thought I would share my experience. I put heating fuel in my fiat fiorino and it ran fine no problems but only did one tank then mixed with Deisel. Prior to that I’ve run all my vehicles on filtered used cooking oil but that dried up so started collecting used engine oil which I filtered and used for over 2 years on one golf 1.9 tdi. Thought it would last a week but was still driving 2 years later absolutely no problems. Only time I encountered problems was if someone gave me oil that had been drained from a head gasket job and that was a real pain.
