The latest issue of AMSOIL Action News announced a new oil fill cap for use with ba bypass oil filter for Ford, Dodge, and Duramax. When I put an AMSOIL bypass on my 99 Cummins I had to modify the old cap and actually glue it back together. Always worried about the glue breaking if I screwed it back on too tight. The new AMSOIL filler cap eliminates this problem for fifty bucks dealer or preferred customer cost.