It depends on what weight I use! Kia Manual authorizes 5w20, 5w30 and 10w30
5w20 - quart every 3000mi
5w30 - quart every 8000mi or so.
10w30 - only tried once, and it was M1HM 10w30 so also A3 rated, didn't burn a drop in 10,000+ miles, but also felt a bit sluggish.
On the wife's car, it burns a little at the start of the OCI, but then sits at 3/4 full for 10,000 miles, using M1AFE 0w20 and M1EP 0w20 if it goes on sale.
5w20 - quart every 3000mi
5w30 - quart every 8000mi or so.
10w30 - only tried once, and it was M1HM 10w30 so also A3 rated, didn't burn a drop in 10,000+ miles, but also felt a bit sluggish.
On the wife's car, it burns a little at the start of the OCI, but then sits at 3/4 full for 10,000 miles, using M1AFE 0w20 and M1EP 0w20 if it goes on sale.