K, you mechanics out there!!!, AMSOIL European 5W-40 or MOBIL 1 0W-40. Also any stickys out there on storing my ( new to me) 2004 in a non- heated Wisconsin winter shed??? You guys are great help!!! Thanks again in advance!!! Did my cab filter today cuz of stickys on here! Great info and boy did it need it!! Only 15mins used a good carbon replacement filter $35!!! This thing is more expensive then maintaining my HD!!! Sure LOVE her though!!!