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Old 06-10-2021, 11:16 AM   #1
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Differential Gear Oil

My manual specifies Chevron Delo Gear ESI SAE 80-90W gear oil. Just wondering what others are using. TIA.
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Old 06-10-2021, 11:32 AM   #2
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I have always relied on Lucas Synthetic gear oil. Same for the front wheel bearing oil bath. Don't think there is a lot of difference in major brands though.
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Old 06-10-2021, 11:50 AM   #3
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Oils are like pizza, everyone has a favorite. I swapped out the factory oil with Lucas synthetic gear oil. The only reason was, I had used it in my Harley's gearbox, it shifted nicely, and was available at my local auto parts store.
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Old 06-11-2021, 09:59 AM   #4
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Amsoil severe gear oil.
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Old 06-11-2021, 06:03 PM   #5
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Dana/Spicer has a list of approved lubricants and manufacturers. I used the heavier oil for planned trips west.

https://media.spicerparts.com/cfs/fi...store=original
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Old 06-11-2021, 11:16 PM   #6
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and like many things there are high priestess for not the engineering aspects but the costs - any high quality lube, especially best is a synthetic gear lube works well.


way back saw some experience on trucks hauling heavy boats to lake for distance and guys would measure the temp of their diffs while and after the distance, the huge drop in temps occurred from synthetic, various organic lube did NOT show the reduction in temps.


so whether costco, walmart or expensive brand synthetic, it is the synthetic aspect that matters, the slickness, then next all other factors etc.


check utube you will see various farm/down home type tests done in comparisons, as ONLY PR seems to ever come out of name brand or otherwise from actual engineering firms as proof of quality comparing to other lubes.


much like comparing med drs, no institute will tells us the 'quality' of a drs work, AMA does not allow it, so blind we are to that and most 'quality' proof of most things !
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Old 06-12-2021, 12:47 AM   #7
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85W-90 GL-5 HP is what we use. Can't source locally had to get on Amazon at that spec.
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Old 06-12-2021, 06:19 AM   #8
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Thanks guys. Found Mobile Delvac 1 75w90 on Amazon for $22/gallon. Ordered two gallons.
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Old 06-12-2021, 09:11 AM   #9
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I'd bet most people never even think about the fluid in their rear diff, so the fact you are even changing it is a plus.
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Old 06-13-2021, 01:47 AM   #10
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Amsoil 75w-90 full synthetic
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Old 06-13-2021, 05:07 AM   #11
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Quote:
Originally Posted by RetiredBob View Post
Thanks guys. Found Mobile Delvac 1 75w90 on Amazon for $22/gallon. Ordered two gallons.


Thatís what I used in my DP as it also meets the Mercedes/Detroit Axle requirements. I bought it from Summit Racing.
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Old 06-14-2021, 02:34 AM   #12
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How I changed the differential oil on our Winnebago with a W24 Workhorse chassis. With a DANA S130.
AKA The Forgotten Oil Change
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