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Gear oil is a lubricant made ... the temperatures of motor oil, it does warm up appreciably as the car is ... under U.S. Military specification MIL-L-2105D (formerly ...
The oil fails the test at a particular temperature if the oil is too viscous. The grade of the oil is that associated with the coldest temperature at which the oil passes the test. For example, if an oil passes at the specified temperatures for 10W and 5W, but fails at the 0W temperature, the oil is grade 5W. It cannot be labeled 0W or 10W.
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Methylenebis(dibutyldithiocarbamate) is an additive in some extreme pressure gear oils, serving as an antioxidant and protecting metal surfaces. [1] The early extreme pressure additives were based on lead salts of fatty acids ("lead soaps"), "active sulfur" compounds (e.g. thiols and elementary sulfur), and chlorinated compounds.
Usually, it is coloured red or green to differentiate it from motor oil and other fluids in the vehicle. This fluid is designed to meet the unique demands of an automatic transmission. It is formulated to ensure smooth valve operation, minimize brake band friction, facilitate torque converter function, and provide effective gear lubrication.
The NSG370 does not use standard gear oil for lubrication. This transmission utilizes bronze synchronizer collars resulting in sensitivity to lubricant make-up. Only a fluid characterized by Chrysler specification MS-9224 should be used in order to avoid premature wear or failure of internal parts as well as voiding the factory warranty. [2]
On the other hand, Ford cars used Mercon V (Ford part number: XT-5-QMC) until 2007 MY. After 2007 Ford made some hardware and calibration modifications so that from 2008 MY it is required to use Mercon LV oil (Ford part number: XT-10-QLVC). Later Ford authorized back servicing transmissions from 2000 to 2007 with Mercon LV.