Synthetic Gear Lube?
#1
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Location: Antioch, Ca
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Synthetic Gear Lube?
What's a good synthetic lube to put in the diffs? I'm thinking about changing the gear lube from conventional and going to synthetic. I want to reduce thermal breakdown and increase lubrication.
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#10
JK Jedi Master
I've used Mobil 1 and Valvoline. The reason I've switched is because sometimes it can be difficult to find the brand/quantity you need. Generally, I prefer Mobil 1 (been using Mobil 1 synthetic lubes in all of my vehicles for nearly four decades).
From the '07 owner's manual:
Axle Differential (Front): Mopar Gear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent.
Axle Differential (Rear) 198 RBI (Model 35) and 226 RBI (Model 44): Mopar Gear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent. For trailer towing, use Mopar Synthetic Gear & Axle Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-Lok require an additive.
Note (from me, Mark) about the Trac-Lok (Limited Slip Differential) additive: Both Mobil 1 and Valvoline have the correct friction modifiers and DO NOT require the additive. Adding the additive when it's not required (or using too much or not using any when it is required) will cause differential problems. Know your gear lube if you have LSD!
BTW: Can't personally confirm this, but some people with what seem to be good credentials have writen on this forum that the JK is delivered from the factory with all synthetic lubes.
From the '07 owner's manual:
Axle Differential (Front): Mopar Gear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent.
Axle Differential (Rear) 198 RBI (Model 35) and 226 RBI (Model 44): Mopar Gear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent. For trailer towing, use Mopar Synthetic Gear & Axle Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-Lok require an additive.
Note (from me, Mark) about the Trac-Lok (Limited Slip Differential) additive: Both Mobil 1 and Valvoline have the correct friction modifiers and DO NOT require the additive. Adding the additive when it's not required (or using too much or not using any when it is required) will cause differential problems. Know your gear lube if you have LSD!
BTW: Can't personally confirm this, but some people with what seem to be good credentials have writen on this forum that the JK is delivered from the factory with all synthetic lubes.
Last edited by Mark Doiron; 01-29-2010 at 03:06 AM.