I have a '89 Montero with the 3.0L V-6. I read my owner's manual and the factory shop manual which both stated that the motor takes 5.0 quarts, including the oil filter. I was changing the oil for the first time since I have owned it, and only placed 4.5 quarts to test the dip stick level. After starting the motor, I let it run for about 20 seconds to get the oil circulated, then shut it down and let the oil settle for a few minutes. I pulled the dip stick and wiped it knowing it is always a false reading; the second time showed the level at about one half quart over the "Full" mark. I spoke to a Mitsu mechanic who said they have never put 5 quarts in the 3.0's?? He said they use 4.5. Has anyone run across this? Any assistance and insight is appreciated. Thanks.