i have a 1996 2.5 legacy i seem to be burning about a half qt a wk on a 200 mile work wk my friend drove behind me and said he seen smoke come out of the tailpipe when i downshifted and got on it alittle bit if im burning oil how much time do i have left on this engine? also when i drive for awhile sometimes the car when i press the gas it dont wanna go and then it will just like take off if i let of the gas alittle bit does this sound like a fuel pump or sensor or could this have something to do with it burning oil. i have had numerous things done to this car already like head gasket,crank shaft seals, timig belt, plugs AND wires , coil ,radiator , water pump etc etc etc etc someone PLEASE HELP