Amsoil 75W-90 (uoa), Nissan murano z51, transfer gear box 16858km(10475mi)

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AMSOIL Severe Gear Synthetic Extreme Pressure 75W-90 working out of the transfer case of the Nissan murano z51 vq35de after 16858 km(10475mi). Transmission oil: AMSOIL Severe Gear Synthetic Extreme Pressure 75W-90 (art. SVGQT) Cars: Nissan murano z51 V6 3.5 vq35de Total mileage: 163,991 km Mileage on oil: 16858 km Service life: August - January. Mode: 65% city, 35% track Volume of oil to be poured: ≈330 ml Oil selection: everything that has drained through the drain plug. Additives: no Previous oils: 120500-134971km, Idemitsu GL-5 80W90, 134971-147111 km, ZIC GFT 75W-90 API GL-4/5, 147111 - 147133 km, ZIC GFT 75W-90 API GL-4/5 (flushing with fresh oil) 147133-163991 km, analyzed oil AMSOIL Severe Gear Synthetic Extreme Pressure 75W-90 (art. SVGQT) [Linked Image] Silicon from the sealant, this time it turned out somehow strongly with excess (((+ contamination during discharge.
 
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7,961
Viscosity looks good, though I thought it would end a little thicker ([email protected]) Flashpoint: is that the "172" number at the bottom? If so, that seems low, though I don't think that matters much in a diff. Re: additives: who knows what Amsoil uses that we're not seeing here? I haven't looked at a GL UOA in a bit, but the additives look a little light to me. Boron and especially Phosphorous stand out to me as being low. Must be a GL-4/5 lube? Is GL-5 prohibited in most transfer cases?
 

MolaKule

Staff member
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21,196
The later Nissan transfer cases do spec a 75W90 GL-5 fluid, and because of the small volume, they do need to be changed frequently. My 2012 Frontier's TC case specifies a 7.5 cSt ATF (NissanMatic D).
 
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You're basing that on Fe numbers, right? I wouldn't necessarily call the UOA Fe number decreasing by half as "twice as good as the previous oil." I don't think it works that way.
 
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This analysis(Amsoil UOA) also determined the mass fraction of mechanical impurities (ГОСТ 6370). Result: no. Honestly, I don't know what other parameter (besides the amount of iron (and other metals indicating wear) in the used oil) can be used in the analysis to determine wear? (I read your forum through a translator, so the meaning and meaning of the written is often distorted.) If it's not difficult, tell me briefly what other parameter (from the available in UOA) you need to pay attention to?
 
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