I thought the XL-18 additive was now being discouraged because it might have long term harmful effects on the synchros. I would not mind trying it, the $23 is worth the experiment, but if it negatively affects the longevity of the synchros, then no way.
My transmission mostly shifts fine but that 1 -> 2 nibble is there most of the time, weirdly, particularly when turning left.??? Makes me wonder if the transmission torques out of line with the shifter a bit during a left turn.
Deysha can you confirm whether use of XL-18 is now thought to be harmful or not?
2011 GT 5.0 PREMIUM
3.73, MT82, Short Shifter, Dropped, Steeda Adj. UCA, UPR Catch Can, 20x11's and 275s, Roush Exhaust, Steeda CAI, 91S and 91R tunes, Hawk/Brembos 4 corners, Black tails, heads, markers, emblems, etc, 2k watts audio, nav, roush front end w/fogs, roush rear and side lowers, roush 6 line grill, 43k on odo, getting ready for FI in a few months...