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Bleeding knuckles
Member Since: 10 Jan 2019
Location: Kent
Posts: 114
  
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Hi all, going to be changing the front and rear diff oil soon. I know there a required quantity for each, but how precise does that have to be. Can you fill until you see oil coming out or it that going to damage anything? 2005 D3 SE Auto, zermatt silver
Gearbox flush by terrain vehicles
V8 brake upgrade
Will always ask silly questions
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 11th Sep 2021 6:36 pm |
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DN
D3 Decade
Member Since: 24 Jun 2006
Location: W.London.
Posts: 2293
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If you fill until oil comes out of the filler hole, you will have overfilled it, which can cause damage to seals/ gaskets, resulting in leakage. Best to fill with the correct amount as near as possible. D3 owned from new, P017 brake recall, BAS FBHIC, new FBH, LR013487 oil pump, new water pump. RRS front lower suspension arms. New suspension compressor/ relay. New Denso alternator. CuNifer rear brake pipes. New GKN rear propshaft. New HPFP belt & tensioner. New A/C Condenser.NO WARRANTY for many many years.
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| 11th Sep 2021 6:49 pm |
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kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6562
 
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Diffs are to be filled according to amount, NOT “fill to spill” 
It doesn’t have to be to the milliliter, though, it’s not a so exact science.
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| 11th Sep 2021 7:44 pm |
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garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1115
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I am sorry but I have to disagree with the previous two posters.
Over 200,000km and 11 years I have filled until it runs out - same as tfr case - never had an issue or leaks. I have tested the amounts that go in and it is not really different to the specified amount - only a few ml in it.
The specified amounts might work on a new diff but the reality is that with an oil change, depending on what you do there is always oil left in the diff and as such means the actual amount of oil in the diff varies when you fill to the specified amount. In some cases you cannot get the specified amount of oil in.
As I indicated, I have had no issues filling to spill and there is only a few ml in the difference. I change my diff oils every 24,000km so have changed these oils 8 times with no issues.
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| 12th Sep 2021 2:32 am |
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