AntiqueIron
Silver Member
For me at least the dipstick is as much about fluid condition as level.I think we've reached the point where automatic transmissions are no more likely to leak than manuals. When was the last time you saw a dipstick on a manual transmission?
I pay close attention to the color of oil when checking it- too dark and I change it, life remaining be darned.
Manual transmissions, like drive axles and gearboxes, once they’re broken in tend to be easy on oil. Big concern is really moisture building up.
I service my automatic trans and T case on my truck twice as frequently as I do the axles for that reason. (25k trans/T case, 50k on driveline)
There’s also the bit of trying to add oil to an auto trans that doesn’t have a dipstick, real pain in the behind.
I drive moderate, not a granny but not a lead foot. My trans likes to operate at 120-150 usually but in the summer she’ll warm up to 180 on the hills. Warm enough that oil breakdown will occur. I’ve heard of a lot of transmissions that will run up to 210 or so.
Granted I work on tractors and not cars, but then again I never heard of somebody who never changed the gear oil in a manual box and lost it at 150k (Not that I would try it!) It will kill an auto to do that though.
