Bought a 99 Trooper that was using a quart of oil every 450 miles. Replaced the PCV valve and cleaned out the line. Then had an oil flush (to loosen the oil rings) and put in Mobil 5W20. Have driven the car 1500 miles and the oil level is down maybe 1/4 quart. Next step is to add some BG44K to the gas to clean the cylinder heads, injectors, valves and power rings and see if the oil consumption stops even more. Might work for you as well, good luck.