Join Date: Dec 2005
Drives: 2006 Kia Spectra5
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your 05 4WD Sorento w/LSD in the rear.
Service manual shows: Front-(Mobil-Lube HD), (Shell-Spirax HD)
Rear- (Mobil-Infilrex 33,SK GL-S)
Good luck finding the Infilrex......................
What we usually do.........................
BOTH diff's will take a API/GL-5 type gear oil. for the front use ANY API/GL-5 85-90wt gear oil. it takes 1.3L
for the rear you may use the same API/GL-5 85-90wt gear oil, BUT for LSD you will need to ADD 1 8oz of LSD additive. it takes 1.6L to fill.
Your rear LSD gear oil can be hard to find, the dealer may only have "Bulk" quantities on hand for the service techs.
We use "Valvoline" API/GL-5 gear oil, easily available at Pep-boys, Autozone, Kragens, Wal-mart, Kmart, etc..... comes in 1Qt bottles in stores.
We use the same gear oil front & rear, LSD & non-LSD diff's.
Valvoline API/GL-5 85-90wt.
We add a tube of "Pennzoil Equa-torque" LSD additive for the rear LSD.
this small tube(8oz) is also available at the same stores and is not expensive.
Same additive for GM carbon/disc type LSD(which is what you have in your Sorento). Hope this helps.