i have just searched and found tip service in renntech under 996 carrera diy's/maintenance, confusing, a bit, is that tip the same as far as servicing fliud/filter replacement procedure with temp changes etc. to follow ? are the tips the same in carreras and tt's? i would think there would be some differences at least and possibly different fluids, they mention a couple different fluids for different model years, but it is still confusing...can someone give me/us the strait skinny?, thanks, kk