Replacing The Differential Oil - Kia Forum
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post #1 of 4 (permalink) Old 12-19-2005, 07:52 PM Thread Starter
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I'm about 500 miles from changing the front and rear differential oil on my '05 Sorento and I'm having a real hard time finding the oil that Kia recommends and the capacities so I know how much I'll need. So far the only oil I've found is Silkolene BOA 90w at $5.25 a litre for the front differential and Silkolene BOA 80w90 (also rated at 85w90) at $4.25 a 1/2 liter for the limited slip rear. Has anyone had better luck finding the recommended oil or know the capacities for both differentials?

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post #2 of 4 (permalink) Old 12-19-2005, 08:46 PM
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Make it easy on yourself and you'r Sorento.
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post #3 of 4 (permalink) Old 01-12-2006, 04:00 PM
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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.
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post #4 of 4 (permalink) Old 02-07-2006, 04:24 PM
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I replaced mine with Redline 75-90 in both the limited slip rear and front of my 03 4wd about a year ago and have had no problems with it. What I like about the Redline product is that it does not require a LSD additive.
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