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KJ General Discussion

Rear Differential Gear Lube


This is a discussion on Rear Differential Gear Lube within the KJ General Discussion forums, part of the Jeep Liberty - KJ (02 to 07) category!
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Old 02-25-2017, 11:55 AM   #1 (permalink)
 
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Default Rear Differential Gear Lube


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I know many of us like using the dino gear lubes, and I have been too.
I've been using Lucas 85w-140.
Mopar does still recommend synthetics.

Ya I should make a video of the 85w-140 after sitting in the bottle when it is below freezing outside. It a sticky goop that has the consistency of Jello LOL..
I am experiencing a sticky Trac lok diff and seems to take a long time to warm up, when it is cold outside.
My next test is to mix these 2 together in a glass and see what happens.
Would like to free the diff up a bit and I think the lighter synthetic and the heavy duty dino may work well together?

So We may end up trying 50-50 of each in a test glass and see how they react together frozen...ha ha..
Any thoughts on this?
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Last edited by LibertyTC; 11-14-2017 at 05:01 PM. Reason: replace images PB removed em
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Old 02-25-2017, 12:08 PM   #2 (permalink)
 
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I've tried both dino and synthetics at full strength and with the appropriate modifiers for my Trac-Lok and never noticed a difference. We can get single digit (F) where I am (not this year). I only use the dino now and I don't tow so I use the 75-90 or 80-90. That's what my Ranger and Subaru call for so I only need one flavor for all.

I like your experiment. Sounds interesting.
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Old 02-25-2017, 12:26 PM   #3 (permalink)
 
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I read many times to never mix oils. IMO: use one or the other not both!

Maybe trac lock is the problem not the oil ??
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Old 02-25-2017, 01:43 PM   #4 (permalink)
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Just use regular old Dino
I would not mix them
If it worked someone would already be selling it as the greatest product to ever hit the streets of Moshi.......
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Old 02-26-2017, 03:57 AM   #5 (permalink)
 
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Ya.. but how much fun is that? Time for TC's kitchen lab test results!
First off IDK what the heck is in the Dino Lucas 85w-140, but anyone who had used this stuff knows it sticks to gears, like nothing else out there. = excellent protection.
The Lucas dino 85w-140 is very similar to a blue bottle of STP oil additive, when it comes to sticky.

So...

Ok so it is about a 75 % dino & 25 % synthetic mixture, which can be played with.
You can feel the difference in flow rate and clarity in the synthetic.
Pics are from video screen shots, oh well..
Ok I am impressed, even cold it mixed well together..

No pic but mixture was then heated to 150F as in warming up the gears and then was stirred very well again.
Anyways after 2 hours back into the freezer. The mixing is good with the lube so far, no separating back to a thick solid onto the bottom after 2 hours.
I think I may go with 40 % synthetic and 60 of the much thicker dino.
Freezer test next after 10 hours
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Old 02-26-2017, 08:19 AM   #6 (permalink)
 
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Ok, we got a "TC is the oil guy" thread. Interesting .


I have been using dino. I know diff oil can get thick especially in cold weather. But here's the thing. When I warm up the Jeep and it is real cold out I like to only let the engine run for a minute and then "drive it" slowly at first through town because that warms up the entire drive train diffs and all before I get on it on the interstate. That's just me and what I do.


Good interesting thread, TC.


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Old 02-26-2017, 09:33 AM   #7 (permalink)
 
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x2. I think there's enough of an oil film on things to protect it while it warms up. But it's fun to experiment!
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Old 02-26-2017, 12:57 PM   #8 (permalink)
 
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The mixed Lucas gear lube is out of the freezer after 10 hours.(close enough)
Click on image to see video:

The synthetic has increased flow even at 25% synthetic & 75% Dino.
It remains mixed perfectly. Looks like I now have created a quality semi-synthetic!!
Probably a 60% synthetic /40% Dino will get mixed, for the in Jeep testing.
Keep in in mind I do tow, & that alone the the 85w-140 is way too thick when cold.
I believe this mixture will free up the diff when cold, and may even offer better MPG?
Of course the Mopar limited slip additive, will be used for the Trac-lok...
Future results after installation, will follow in the future.....
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Last edited by LibertyTC; 02-26-2017 at 05:11 PM. Reason: fix video problem link
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Old 02-26-2017, 01:36 PM   #9 (permalink)
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Really need to also check to see if there are any additives between the 2 that may react badly when mixed long term.
I don't see that small amount helping much with gas mileage in the grand scheme of things.
I'll take the 85-140 and deal with minor thickness until its warmed up for the protection.
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Old 02-26-2017, 06:21 PM   #10 (permalink)
 
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Good question to ask on the oil forum.
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