I recently purchased a 2008 Tourmaster 40B with the Cummins 425 HP engine. I'm trying to figure out just which Cummins engine it is so I can get information on oil filters and engine oils for this beast. Can anyone help me? Cummins says it could be an ISC, ISL, or OSX engine. I'm at 208-569-0495 if you want to call and commiserate with me
Thanks folks