2016 2500HD, 6.0 flex fuel engine and 6L90 transmission. 56k of very light usage, nearly zero towing but using 4x4 on occasion in the winter.
Changed the transfer case fluid and checked the transmission dipstick for the first time recently. Transfer case fluid was brown and nasty looking, fluid on the transmission dipstick looks new.
Not sure if it means anything at all, really, but I was surprised at the difference. The truck has a heavy duty trans cooler and transmission temps are usually below 130, so maybe that explains why the transmission fluid looks so nice.
In retrospect I’d have changed the transfer case fluid sooner, but I haven’t noticed any noise or other issues.
Changed the transfer case fluid and checked the transmission dipstick for the first time recently. Transfer case fluid was brown and nasty looking, fluid on the transmission dipstick looks new.
Not sure if it means anything at all, really, but I was surprised at the difference. The truck has a heavy duty trans cooler and transmission temps are usually below 130, so maybe that explains why the transmission fluid looks so nice.
In retrospect I’d have changed the transfer case fluid sooner, but I haven’t noticed any noise or other issues.