I'm looking to change the tranny oil in my l3000dt. It has 300 hrs now and I'm just anal about maintenance. I bought it a month ago and changed every fluid in it except tranny/ hydro. I have on hand a bunch of ambra 134 for my new holland and ford. Dealer says ok to use in gear drive instead of sudt. Plus it's $$88 per 5 gal vs $130. What's your guys opinions/exp/ expert analysis. And I apologize if this has been asked before but I can't use search function for some reason.