i have heard it works very well, but there are 2 things to consider.
1. is there any carbon in there?? and if there is does it matter?
2. what are the chances of screwing it up?
i dunno about #2 it is very hard to hydrolock a rotary

mike
69 280s
59 tr-3a
72 r100
2x 85 rx-7's
88 rx-7 3 rotor
93 rx-7