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  1. SoNic67

    Gear oil 80W-90 versus 75W-90

    see a lot of people asking if their specification 80W-90 can be substituted with something else. Invariably the chorus here says "use 75W-90 is better because muah, synthetic". Since my car differential and transfer case also requires 80W-90, I kind of thought... why Toyota din't say 75W-90 if...
  2. SoNic67

    Tungsten Disulfide (Wolfram Disulfide)

    Anyone has any experience with mixing WS2 in gear oils? Positive, negative? I understand that will create a very thin film (particle size thickness), with ultra low friction. I am tempted to add one oz of WS2 in each of my rear differential and the transfer case. Both non LS, the differential...
  3. SoNic67

    Open differential and transfer case - additive?

    I have a 2011 Toyota RAV4 4WD with a small whine from the differential at about 30-40 mph. This was a well known (TSB) issue when cars were in warranty, but I bought mine used, so there is no warranty. The car has one transfer case in front and one rear differential, electrically controlled. I...
  4. SoNic67

    Adding an engine oil bypass filter - toughts?

    I am considering adding an engine oil bypass filter on my RAV4 V6 engine. Basic information for this is linked below, so I won't get people yelling at me that I will destroy the engine: https://lubepoint.wordpress.com/2013/05/23/understanding-engine-oil-bypass-filtration/ I did look at: 1...
  5. SoNic67

    XADO Transmission additive?

    Did anyone used this product in their transmission? I have a small whine noise in my Toyota U151F transmission. In the past Toyota extended the warranty for that. I bought the car second hand and the previous owner didn't do anything about that extended warranty, he just let it lapse and traded...
  6. SoNic67

    Toyota RAV4 transfer case fluid.

    I have a 2011 RAV4, V6, 4WD, bought used this year, now has 72k miles. The manual says to use for the transfer case and rear diff GL-5 SAE 80W-90 oil (0.48 qts). I did a drain and filled with Super Tech 75W-90 Full Synthetic, just to see if it makes a difference. The light whine that I was...
  7. SoNic67

    Castrol fluids

    Well, there are a few more days that Advance Auto runs the promo 2 qt for $11 of Castrol ATF. The stores in my area are all out of the "Mercon V" fluid (I was told that someone bought 30-40 bottles at once). I managed to buy only 7 qt of "Mercon V" and drain and refill the daily driver 2001...
  8. SoNic67

    My 'magic' oil - Valvoline Synpower 20W50

    My Ford Explorer with V8 5.0L engine, had an issue with oil pressure since I have bought it (used, 83k miles). Those engines where designed in 60's, with 20W40 in mind, sold in Explorers with 5W30 and, in the last two years of fabrication (2000 and 2001) where sold as taking 5W20. Mine is a...
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