According to my manual (a Hyundai), some of the "severe" usages which suggest a quicker oil change interval are: - repeated short distance driving - extended

According to my manual (a Hyundai), some of the "severe" usages which suggest a quicker oil change interval are: - repeated short distance driving - extended periods of idling or low peed operation - more than 50% driving in heavy city traffic during hot weather above 90F If you've got a commute in heavy traffic in a Southern US state or just a really short commute of only a few miles where you're not really getting things well up to temp, its pretty easy to hit these "severe" situations.