New to the site, usually don't join sites just visit and read. Liked this one and it's content, so thought I would give it a try. I own a 02 Dodge 2500 (cummins) with 118,000 ml and a 04 F650 with a vt365 6.0L with 171,000 ml on them thought about switching from Rotella 15wx40w to an Synthetic...