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I need to buy a whole lot of gear oil for my Toyota Tundra 4x4. Specs say I should use 75W-90, but I can get a great price on bulk by the gallon of 80W-90. Is this difference in viscosity significant enough to worry about? PLEASE...real world experience and/or sound theory, not supposition...

I'm gonna have to replace my tires within 5k mi. Most dealers are now offering nitrogen. Some throw it in with a set of tires, others charge for converting. What are your experiences? It seems like no-brainer for me since the tire dealer will include at no extra charge. But what about my 2008...

My recently-acquired Tundra 4X4 has never had the gear oil changed in the differentials or transfer case. The manual calls for API GL5 75W-90 gear oil. However, a guy at a very reputable high-performance 4X4 shop said he puts ATF in a lot of differentials. Subsequent Googling has indicated...

This truck as 260k mi on it. Transmission was serviced by previous owner at a dealership at 199k mi. Paperwork says "Flushed; added 14 qts" so I assume they used a machine since only a couple of quarts come out with drain/fill. Question: With 60k miles miles on it since previous trans service...

My high mileage Toyota Tundra 4.7L V8 uses 5W-20. I recently acquired a case of Lucas full synthetic oil 20W-50 at $1/qt. Various people have advised me not to use it in the truck because of its viscosity. I have been thinking of flushing the engine with either kerosene or SeaFoam per...