I am considering switching to 75W-140 GL-5 synthetic gear oil in my Frontier's rear differential. It has the C200K that the manual calls for 75W-90 GL-5 synthetic in, but I have read on forums that some use the heavier gear oil, and someone even claimed that a warranty replacement had 75W-140 added from the dealer.
The reason I want to try 75W-140 is noticeable gear whine maintaining speed at one speed range, and whine only under acceleration at a higher speed range. I replaced the gear oil a few thousand miles back with 75W-90, and there were no large particles in the oil, but enough fine shavings stuck to the magnet. I would have expected to see that amount of shavings at maybe twice the mileage. They almost felt like grease, but had a slight roughness to them.
Anyone know if the tolerances in the C200K are enough for 75W-140 to properly lubricate everything?
The reason I want to try 75W-140 is noticeable gear whine maintaining speed at one speed range, and whine only under acceleration at a higher speed range. I replaced the gear oil a few thousand miles back with 75W-90, and there were no large particles in the oil, but enough fine shavings stuck to the magnet. I would have expected to see that amount of shavings at maybe twice the mileage. They almost felt like grease, but had a slight roughness to them.
Anyone know if the tolerances in the C200K are enough for 75W-140 to properly lubricate everything?