Forum Discussion
SoCalDesertRid1
Jul 23, 2012Explorer II
A 4500/5500 cab/chassis truck used for commercial purposes is often a very heavily used and abused truck. It's service intervals would fall under the 'severe' category. If the owner's manual says change it at 7500 miles, that's what I would do.
About Travel Trailer Group
44,060 PostsLatest Activity: Mar 28, 2026