The box is very nice to use. It's never failed to get into gear, even on
cold days (not that I drive it much in winter), and never baulked. It's
far better than what I remember of driving my dad's Vitesse in
the late 1980's - that was a pig at baulking.
How much of this is the 'H' suffix, and how much is down to just being
a good box I don't know. I also don't know what oil is in the box.