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Old 09-18-2020, 01:44 PM   #1
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Rear differential oil change routine

Been reading lots about frequency of rear differential oil changes on diesels, Freightliner says 100,000-250,000 depending on axle make, or 12 months whichever comes first.


12 months seems a little excessive and I wondered how many actually do it, or what other time period?
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Old 09-18-2020, 02:09 PM   #2
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I have a 2008 and the only time I changed it was 2 years ago. The job can be a pain, the hard part is getting the new oil back in (not much room at the top of the differential.
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Old 09-18-2020, 02:16 PM   #3
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Just changed ours this year on 2002 MADP with ~90,000 miles. Pretty sure it had never been changed. Old fluid was clean magnetic plugs had very little sludge. Draining was easy, adding new took some time as mentioned as no room above.

Also it is important to be on flat ground and at ride height to fully fill and check fill level.

2002 Newmar MADP Differential Fluid Change
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Old 09-19-2020, 12:20 AM   #4
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Quote:
Originally Posted by wagonmaster2 View Post
Been reading lots about frequency of rear differential oil changes on diesels, Freightliner says 100,000-250,000 depending on axle make, or 12 months whichever comes first.


12 months seems a little excessive and I wondered how many actually do it, or what other time period?
If you switch to the specified synthetic lube, the change interval is 24 months instead of 12.
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Old 09-19-2020, 05:39 AM   #5
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I see it is on the service sheets for annual change. Don't have my receipts with me but sure that Gaffney changes mine every year.

This is Freightliner's explanation for changing it so frequently.

The normal operating temperature of compounded lubricants during the summer season is about 160 to 220F (71 to 104C). The chemicals and additives that give these lubricants increased load carrying capacity oxidize faster at temperatures above 220F (104C), contributing to more rapid lubricant deterioration. For this reason, lubricants of this type that operate continuously at high temperatures must be changed more frequently.
NOTICE
Failure to change the axle lubricant at more frequent intervals, when adverse operating conditions require, could result in axle damage.
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Old 09-19-2020, 06:22 AM   #6
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I see it is on the service sheets for annual change. Don't have my receipts with me but sure that Gaffney changes mine every year.

This is Freightliner's explanation for changing it so frequently.

The normal operating temperature of compounded lubricants during the summer season is about 160 to 220F (71 to 104C). The chemicals and additives that give these lubricants increased load carrying capacity oxidize faster at temperatures above 220F (104C), contributing to more rapid lubricant deterioration. For this reason, lubricants of this type that operate continuously at high temperatures must be changed more frequently.
NOTICE
Failure to change the axle lubricant at more frequent intervals, when adverse operating conditions require, could result in axle damage.
I have Gaffney do my annual service and they change mine every year. About $60 + for that item.
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Old 09-19-2020, 03:43 PM   #7
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I switched to synthetic at the first change and now do it every 3 years.
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Old 09-20-2020, 03:32 PM   #8
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I have Gaffney do my annual service and they change mine every year. About $60 + for that item.

Man, that is a deal. Last time I changed mine it took either 10 or 11 quarts at $6 per quart from Auto Zone.
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Old 09-20-2020, 04:20 PM   #9
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I just got home from a short trip and checked the paperwork from Gaffney. They are changing the Drive Axle oil every other year.

See attached checklist.
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Old 09-20-2020, 09:56 PM   #10
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I changed mine to 85-90 synthetic at 100000 miles, do not expect to ever to it again. Do shoot my pumpkin at every stop and have never seen it over 180 F.
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Old 09-21-2020, 12:49 AM   #11
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If you switch to the specified synthetic lube, the change interval is 24 months instead of 12.
Looks like my previous statement is incorrect. The official word from the maintenance manual is 12 months for petroleum based oil & 36 months for synthetic (Mobil Delvac 1 is the approved synthetic).
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