I'v been dragging my feet getting all the necessary fluids for some maintenance work on my 2012 Jeep KK and 2003 Suburban, both four-wheel drives. Some of the fluids match up viscosity-wise, but not necessarily fluid type. For example, the older Suburban recommends 'synthetic' products for the front and rear axles but the Liberty states 'SAE 75W-90 Gear Lubricant' and 'SAE 80W-90 Multi-Purpose API GL-5 Gear Lubricant' as opposed to 'SAE 80W-90 Synthetic Axle Lubricant' for the Suburban.

I've always assumed that in these types of applications, synthetic is acceptable. But I don't want to assume and then do long-term damage to any Liberty components.

Your experience and recommendations would be appreciated!

Thank you.

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2012 Jeep Liberty Sport 4-wheel Drive

Wondering the same. Going to change differential in a high mileage KK wondering what is best lube for that and grade.

75W90 Synthetic Gear Oil for normal everyday driving
75W140 Synthetic Gear Gear Oil if you do any towing or live in a very hot environment and want a little extra protection.

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
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Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve

We use lots of 75w140 at my shop it lasts a LOT longer... we only use 75w90 in the euros and aisians


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