My '99 didn't us any oil until I hit the 27,000 mile mark. Now I see the level on the dip stick start to drop after about 1,000 miles after oil change and I'm down a quart by the 1700 mile mark. Now have 37,000 miles on the rig. Use Premium Blue and 3894 filter. Change oil every 2,000 - 2,500 miles. Have not done any hard pulling and don't let it idle much. Not looking forward to having a dealer look at it.