So I just hit 40K miles and I was wondering what general mainetence should be done at this point. Obviously the oil has been kept up to date. Besides that, the coolant has been changed but thats about it as far as I know. What should have been done at this point, or should be done in the future, in terms of draining and putting in any new fluids, filters etc. When does the gearbox fluid need to be changed etc. Thanks alot.