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Old 09-21-2020, 04:12 PM   #1
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Gear oil quantity - 2000 Diplomat

Hi guys!

I see in the chassis manual that I'm supposed to change the gear oil. Does anyone know, roughly, how much the diff holds?
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Old 09-21-2020, 04:33 PM   #2
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mine took 4 US gals last time.
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Old 09-21-2020, 05:21 PM   #3
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Thanks Bill !
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Old 09-22-2020, 11:01 AM   #4
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Just had mine replaced. Mechanic had a fresh 18.9L bucket, and it took most of it.
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Old 09-22-2020, 08:17 PM   #5
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Thanks Ben, I was just pricing out buckets of gear oil.
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Old 09-22-2020, 10:23 PM   #6
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Ours took 14 Qts of Red Line synthetic Mil-L -2105D Spec 75-90 synthetic gear oil.
I bought a case on Amazon.
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Old 09-22-2020, 10:35 PM   #7
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I can get a decent price on a bucket of Pennzoil 80/90 that meets GL-5 for $94 USD/127 CAD from my local supply house. That seems to be the best I can do. Can't seem to get 75/90 but I don't think, in my climate, that will matter much.
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Old 09-23-2020, 07:20 AM   #8
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I got a case (12 quarts) Pennzoil 80W-90 GL-5 from Amazon for $75.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I bought a couple extra qts since my owners manual says the axle holds 15 quarts (but that amount is including the "hubs" which don't get drained in a differential fluid change). I only used 12 quarts total.
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Old 09-23-2020, 07:34 AM   #9
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Vito mentioned synthetic oil , is that important ? Are you others using regular
gear oil ?

Bob , it sounds like you are planning to do this yourself . If you are , how will you
get the new oil into the differential ? Is there enough room to use a funnel or will
you have a way to pump the oil ?

Thanks Ray
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Old 09-23-2020, 09:06 AM   #10
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Ray, my chassis manual called for 15q of 80W-90 API GL-5 non synthetic.

And yes, we pumped it in out of a 5 gal bucket.
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Old 09-23-2020, 09:40 AM   #11
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Quote:
Originally Posted by RamiDav View Post
Vito mentioned synthetic oil , is that important ? Are you others using regular
gear oil ?

Bob , it sounds like you are planning to do this yourself . If you are , how will you
get the new oil into the differential ? Is there enough room to use a funnel or will
you have a way to pump the oil ?

Thanks Ray
Pump is best.
You can also put a short flexible hose on the end of the quart bottle and stick that into the fill opening (the bottles have a plastic screw-on nozzle/tip, like a caulking tube). but a funnel wont fit (at least not on my setup).
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Old 09-23-2020, 03:58 PM   #12
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Our owners manual specifies GL-5 gear oil in the lubrication chart (the diagram with all the lube points).
But the Drive Axle and Drive Shaft in section 10 of the owners manual says:
Drive Axle Lubricant
The rear axle is filled with synthetic gear oil meeting MIL-L-2105D specifications.
Change interval is every 250,000 miles, or 36 months, whichever occurs first.

I purchased a small hand pump to add gear oil but I was able to pour it direct from the 1 qt bottle into the fill hole.
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Old 09-23-2020, 04:01 PM   #13
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I'm pretty sure ALL 80/90 gear oil is synthetic. As for whether you need a pump or not, I doubt it. I bet you can pour it right in from the bottle (if using the ones with a snout) or a funnel. There's quite a bit of room down there.
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Old 09-23-2020, 04:06 PM   #14
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Quote:
Originally Posted by vito.a View Post
Our owners manual specifies GL-5 gear oil in the lubrication chart (the diagram with all the lube points).
But the Drive Axle and Drive Shaft in section 10 of the owners manual says:
Drive Axle Lubricant
The rear axle is filled with synthetic gear oil meeting MIL-L-2105D specifications.
.
"Lubricants qualified under U.S. Military specification MIL-L-2105D (formerly MIL-L-2105C), MIL-PRF-2105E and SAE J2360 satisfy the requirements of the API GL-5 service designation."
Cheers,
Walter
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