BTW, I am impressed with how my GX just doesn't use any oil. I drove over 4,000 miles , on the interstate at high speeds, along with quite a bit of stop and go city driving, and the dip stick is still right at the full mark.
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I too have been using Mobil1 since 1990 and will continue this in my GX once it hits 5000 miles. Our current 98 LandCruiser with the same engine as the LX does not burn a drop of oil for the past 70K miles. I use if for sand dunes, off road and towing my 5000 boat. What an amazing engine. Somehow it still pulls harder than my GX.