Hi, I've been researching forums for weeks because my wifes 2002 Trooper with 130,000 miles,has been burning about a quart of oil every 500 miles. I drained the oil, which has always been "DEALER" oil, added five quarts of Mobil1 0w-40, and using a Mobil1 oil filter. Went through two quarts in 800 miles, but the third quart lasted over 1000 miles. I'm going to change the oil before 3000 miles, as recommended by Mobil1. This is looking promissing! I'll post my future experience.