I have a well maintained 2007 Kia Sedona 3.8L V-6 with 260,000 miles on it . I generally rotate around on sale 5W30 D1/G2 rated 5W30 synthetic oils at 5K ~ 6K mile / 6 month OCI's with a Fram Ultra filter. I was curious if there is any benefit to stepping up to M1 0W40 ? The Kia burns no oil and has no leaks on 5W30 synthetic now ... Your thoughts ?