The book says 6000 miles in the US. I remember when I got my previous car 2016 Optima EX, I was happy when I saw a 7500 mile interval. Then when I hit 7500 I went in and they told me that in the northeast the interval is actually 5000 miles. I read the small print that in harsher northern climate the interval was shorter. I didn't see anything indicating a shorter duration in cold climates on my K5 though. I guess I'll find out when I bring it in for my 1st service. If the lockdown doesn't end soon, that might be summer 2022 though. I went from driving 15000 miles a year to 4500 last year.