i dunno if it's me, but after 4k for mobil 1 or 3k for regular oil, i start smelling the oil more.. kinda like the oil is burning or something
Your running the G23 right? That might be why. Maybe it consumes oil at a different rate compared to the H22/H23 and the F23? But 4k sounds about right for synthetic for a customized motor such as the G23