XRS comes on after 5k miles

the car seems to have come on suddenly after 5 K miles. it seems to run differently. i'm wondering if the programming in the control box does this.

i could understand it loosening up a bit but right at 5K its personality really did change. the maintenance light came on, i changed the oil and filter i had bought the previous night. i reset the light as suggested in the owner's manual. i'm using mobil one full synthetic 5-30 as per the manual. i don't think the oil change would make the difference.

any thoughts or experience with this?

sammmm

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SAMMM
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