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- #21
OK so as promised, I did try 75W-140 in the transfer case. I used Lucas Oil Synthetic because that's what Amazon had. Honestly, I don't think it made any difference. At first I thought maybe it was a bit quieter, but the difference is so small that I might have just been imagining it. I made sure to get the transfer case up to temperature too and even then there was really no difference. I don't think it's worth it to use fluid not recommended by Toyota for just a tiny bit of noise difference. Nothing abnormal on the drain plug magnet either btw.
So TLDR, makes no difference. I have switched it back to Mobil 1 75W-90, which is also what I have in the axles, and have come to the conclusion that whatever noise this thing has is probably normal and I'm just nitpicking.
FWIW I think the most important thing with 4WDs, especially if they see off road use, is to use a GL5 oil and change it often. In my experience, Mobil 1 75W-90 seems to do really well in the variety of 4WDs that I've used it in. Doesn't turn dark, very minimal metal shavings, and minimal gear whine (well most of the time).
Anyway, I'm out of ideas for now. I will update the thread if I find anything in the future.
So TLDR, makes no difference. I have switched it back to Mobil 1 75W-90, which is also what I have in the axles, and have come to the conclusion that whatever noise this thing has is probably normal and I'm just nitpicking.
FWIW I think the most important thing with 4WDs, especially if they see off road use, is to use a GL5 oil and change it often. In my experience, Mobil 1 75W-90 seems to do really well in the variety of 4WDs that I've used it in. Doesn't turn dark, very minimal metal shavings, and minimal gear whine (well most of the time).
Anyway, I'm out of ideas for now. I will update the thread if I find anything in the future.