What’s the general thought for a change interval on a manual transmission ? My 2010 Lance’s warranty book says 2 years/ 30,000 mile (48,000 km). I’m convinced this is for the automatic, which shares the same warranty book. The last time I changed it the fluid looked brand new, I replaced it with Redline MTL. I’m coming up on the change interval and am wondering if changing it again is a waste of time. Thanks.