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Has anyone done the math to see how much fuel saving there would be with gearbox oil that is prewarmed somewhere along a 10 minute journey? Does the average joe actually even get his gearbox oil changed at the required service intervals?...I don't...Does gearbox oil actually "wear out" or does it just get contaminated with slivers of metal from missed shifts! Maybe "reconditioning" the gearbox oil and using it for another 2 years would save more money than what would be saved in fuel costs plus the expense of setting up a pre-warm system.
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