Mobil 1 Truck SUV vs Extended Performance

I gave my 09 Altima to my daughter for a work car. Sheā€™s a physicians assistant and drives 150 miles round trip 4-6 days a week. The last several oil changes have been with clearance idemitsu 5-30 from auto zone. She showed up yesterday and I was shocked to see that she had almost 9k on the oil. I had some clearance TSC truck and suv that says ā€œ10kā€ guaranteed so thatā€™s what went in along with an old school fram ultra. She was a half qt down in a car thatā€™s never used a drop. I love my daughter more than life, but the maintenance light along with low tire lights, and any other light is something that doesnā€™t faze her. She just motors on. I set the oil minder for 7500 and sent her on her way. We shall see how this holds up. Iā€™m working my way through all my clearance purchases or Iā€™d have gone with Schaeffers, EP or hpl for some added security. Surprisingly the oil came out still somewhat clean. When I owned the car it was serviced religiously every 4-5k.
 
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