What is Your Severe Service Oil Interval?

2021 Hyundai Palisade. I follow the severe OCI schedule and usually do the oil change between 3500 and the recommended 3750. Maybe once went to just under 3,800. Always use OEM filter and the last change at 43,000 I switch over to Valvoline Restore and Protect. Was using Valvoline Advanced prior when doing my changes and whatever full synthetic the dealer used when I got my free changes at the 7,500 intervals that came with the car purchase for the first three years. First oil change was around the 1,000 mark. Have been using a catch can too which I put in when it got to about 10,000 miles on the odometer. Doing all I can to protect the engine, warranty and lower intake deposits since it’s a GDI engine.
 
My mom has 2011 optima with the 2.4 GDI. I maintained that from 75,000 miles and up. Serviced every 3000 using what ever was on hand.

She still running at 155,000
 
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