Could be leaking from the oil cooler, or it could be the hoses that go to and from it, so I'd replace those too while you're at it. Could also be the front or rear seals on the tranny (ouch), or sometimes there can be a leak from the seal where the shift lever goes through the housing.
Oil filter - anything non-Fram IMHO - for example Wix 51069 or Napa Gold 1069. Oil, anything that meets current Indmar recommendations for your model engine (CG-4/SJ or better). Current spec is CI-4 Plus. Note that this iteration of Rotella has less in the way of pressure additives (zinc) so if your engine has non-roller lifters, it might not be the best choice. You could use synthetic versions that meet those API specs, although there's no real advantage.
'04 MariStar 230VRS/MCX
Last edited by bigmac; 07-08-2008 at 02:53 PM.