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Old 05-08-2012, 08:42 PM   #1
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8.8 Gear oil?

Bought a 8.8 from ECGS with factory limited slip and they recommend 75w140 but not using synthetic gear oil. The Royal Purple has friction additive already in it but it's synthetic. Has anyone tried Royal Purple 74w140? If so any problems?

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Old 05-08-2012, 09:41 PM   #2
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The RP is okay but I'm siding with ECGS on recommending a conventional GL-5 gear lube. Tests by some axle manufacturers like Currie have found the ring & pinion gears run cooler with conventional gear lubes when heavily loaded.

Personally I'd go with Valvoline 85W-140 or similar from others like Castrol, Havoline, etc. Just make sure it says it is compatible with limited slip differentials which means it has the required friction modifier. Or if it doesn't just add a small bottle of friction modifier.

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Old 05-09-2012, 07:36 AM   #3
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I've been to 4 different auto parts stores including Autozone, O'reily's, and 2 Advance Auto. The only gear oil they had 3 qrts of was the Royal Purple in 74w140 and 75w90 and Valvoline 75w140.
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Old 05-09-2012, 07:42 AM   #4
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You may have to go to the dealer.
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Old 05-09-2012, 09:45 AM   #5
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Quote:
Originally Posted by kspencev View Post
I've been to 4 different auto parts stores including Autozone, O'reily's, and 2 Advance Auto. The only gear oil they had 3 qrts of was the Royal Purple in 74w140 and 75w90 and Valvoline 75w140.
Was the Valvoline you found synthetic or conventional?
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Old 05-09-2012, 10:01 AM   #6
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The Valvoline was conventional, but I was unsure about going with the brand.
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Old 05-10-2012, 11:33 AM   #7
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I ended up going with Lucas 85w140 conventional with Trans-x additive.
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Old 05-10-2012, 07:22 PM   #8
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In my 8.8 from ECGS I have always used Valvoline 80W-90 conventional w/ limited slip. Never had an issue.
Used it because it was all Auto Zone had in 4 bottles lol.
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Old 05-10-2012, 09:16 PM   #9
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I would use the conventional Lucas that ECGS recomends
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Old 05-10-2012, 10:31 PM   #10
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I would use the conventional Lucas that ECGS recomends
ECGS only recommended a conventional gear lube, they never mentioned Lucas.
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Old 05-10-2012, 10:36 PM   #11
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Originally Posted by kspencev View Post
The Valvoline was conventional, but I was unsure about going with the brand.
What? Valvoline has a sterling reputation. You can never go wrong with any of Valvoline's lubricants.
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Old 05-11-2012, 08:19 AM   #12
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What? Valvoline has a sterling reputation. You can never go wrong with any of Valvoline's lubricants.
Yep, I've got a few bottles of it myself sitting beside the 8.8 just waiting to be installed.
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Old 05-11-2012, 10:41 AM   #13
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GEAR OIL: THESE AXLES ARE SHIPPED WITH ASSEMBLY LUBE ONLY. FAILURE TO ADD GEAR OIL WILL CAUSE IMMEDIATE FAILURE AND BE VERY EVIDENT. ALWAYS FILL FROM FACTORY FILL HOLE NOT AFTERMARKET COVER FILL HOLE. We recommend Lucas 75w/140 gear oil, Lucas 80w/90 gear oil is also acceptable. We do not recommend synthetic fluids. IF you have a factory limited slip or any clutch style limited slip a limited slip additive will need to be added. TRANS-X makes a good additive that is available at any auto parts store and we also have it available for purchase.
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Old 05-11-2012, 11:03 AM   #14
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I wouldn't get hung up on brands. Any quality conventional oil should be fine, just make sure you add the proper additive if you have a LS.
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Old 05-11-2012, 11:03 AM   #15
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Seems odd that they would not reccommend synthetic fluids. Why would less friction result in more heat? I don't buy it.
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Old 05-11-2012, 11:08 AM   #16
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Seems odd that they would not reccommend synthetic fluids. Why would less friction result in more heat? I don't buy it.
As Jerry already mentioned, Currie has done tests that have shown conventional oil to do a much better job at sinking heat. I believe he has mentioned previously how they found the synthetic oil itself to run much cooler because it doesn't sink heat from the gears as well, thus the gears themselves actually run hotter with it.
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Old 05-11-2012, 11:29 AM   #17
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Ok, if they say so.
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Old 05-11-2012, 11:37 AM   #18
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Not saying anyone here should do X or Y, just simply stating what I've read. You can always do your own testing.

The way I look at it, is others like Currie put their vehicles through much more abuse than I ever will (KoH for one). If they have found conventional to be better for some reason, who am I to argue?
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Old 05-11-2012, 12:23 PM   #19
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ECGS says to use dino gear oil. For warranty purposes use dino gear oil.
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Old 05-11-2012, 05:22 PM   #20
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Quote:
Originally Posted by kspencev View Post
GEAR OIL: THESE AXLES ARE SHIPPED WITH ASSEMBLY LUBE ONLY. FAILURE TO ADD GEAR OIL WILL CAUSE IMMEDIATE FAILURE AND BE VERY EVIDENT. ALWAYS FILL FROM FACTORY FILL HOLE NOT AFTERMARKET COVER FILL HOLE. We recommend Lucas 75w/140 gear oil, Lucas 80w/90 gear oil is also acceptable. We do not recommend synthetic fluids. IF you have a factory limited slip or any clutch style limited slip a limited slip additive will need to be added. TRANS-X makes a good additive that is available at any auto parts store and we also have it available for purchase.
^^This is basically what Chase at ECGS told me when I ordered my 8.8... He also went on to say whatever I do DON'T use Royal Purple just use a quality Dino oil and change it regularly. BTW, 3.75-4.0qts.
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Old 05-12-2012, 08:09 PM   #21
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I spoke with a guy a ECGS and was told that while Synthetic Oil does run cooler, the gears run hotter with it than with conventional oil. He said Synthetic Oil was too thin.
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Old 05-12-2012, 09:20 PM   #22
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Quote:
Originally Posted by kspencev View Post
I spoke with a guy a ECGS and was told that while Synthetic Oil does run cooler, the gears run hotter with it than with conventional oil. He said Synthetic Oil was too thin.
Stick with conventional oil.

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