The factory oil is mineral based and rated at 90deg, the transfer case will see temps of around 100deg on highway driving.
The factory oil is mineral based and rated at 90deg, the transfer case will see temps of around 100deg on highway driving. We upgrade the oil to a semi synthetic type of oil at the same viscosity which has a higher temperature rating. We change the plastic sight glass to a brass type with glass window and replace the plastic fill bolt with a brass type due to seeing failures after a period of time. This allows the service schedule to be put in line with the engine oil change schedule.
FITS: 55S17W, 55-180 (Part # TT07.08)
