Originally Posted by
greyghost_6
There are so many threads on this and other like projects. The final all else fails solution is ammonia or penetrating oil and using fire to heat the frame (expand the steel) and then work the post loose.
+1 on the ammonia since the seatpost is al. ammonia will dissolve the oxidation caused by the al and break the sp free. i've tried it once and it worked (granted i had to mount the seatpost in my bench vise and use the frame as leverage to twist the seatpost loose)