have a 1991 toyota cressida, leaks and burns oil, let the car sit a month and now dry on oil, wheres it coming from and how costly to fix someone said seals i dont know thanks

Could be your front and rear seals. Located above and below your crank shaft at the front and rear of your engine block. Could also be your Valve Cover gaskets, could be your Oil Pan gasket. This usually is not that expensive if you do it yourself, the gasket material is fairly cheap depending on what brand/type you get. Main seals (over and under your crank shaf) usually the rear main seal is suspect. This is a little harder to do because on most vehicles, you have to at least lift the engine slightly from the frame disconnecting the motor mounts, remove the oil pan gasket, remove the rear main bearing cap, remove the seal. Replace the seal, re-install the cap, Replace the Oil pan gasket, re-install the oil pan, correctly torque the pan bolts, lower engine. Should be good to go then. As a good measure, I would reccomend replacing the front and rear main seals, the oil pan gasket and valve cover gasket/s. As for burning oil, that could be your valve stems and the valve seats. This usually means having the cylinder head/s re-built. This can be costly if you have someone do it for you. But if you do it yourself, can save you money, if you have the tools to grind the valves, compress the valve springs etc... If you aren't experianced, you can get a Chiltons or Hanes manual and take a look to see how difficult it is. When all else fails, take it to a competent mechanic to have it done. Of course it will cost, but then it will be better than throwing the $$ for a new car when you could save $$ by having repairs done and drive a lot longer with your current vehicle. Hope this helps.