I filled my 99 disco 2 manual with united e10 and it killed it i was concerned i was up for sensors and lots of money a simple tank of 91 fixed it!! I could not accelerate over 4000rpm unless staionary the left hand cat would glow red if i allowed it to cut out multiple times. It would accelerate sometims give a miss then 4000 rpm nothing just cut out revs would wind down to about 2000rpm and car would take off violently again as i said new tank of fuel and fixed perfect car again