Member Since: 17 Mar 2018
Location: Newcastle upon Tyne
Posts: 7
to flush or not to flush
Hi folks thinking about changing oil in disco 4 gearbox. I was toying with the idea of having it flushed but was told by a ZF specialist not to his reasoning being that all of the flushing fluid does not come out, what is the general consensus.
31st Mar 2018 5:37 pm
kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6691
If you flush with a machine you replace significantly more (in practice almost 10 L) than by dropping the pan (4 L or so) and then replacing the lost volume of ATF. IMO, in the latter you only dilute what you had there.
You might want to search this forum, there are plenty of different opinions. At least three different methods available:
- drop pan & change filter
- filo flush (I think it was originally for a D3)
- mega flush or machine doing it
31st Mar 2018 5:46 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8171
Find a new ZF specialist who knows what he's talking about and not looking for future work. ZF recommends an oil change* every 75k miles normal use and every 35k miles if working hard
* drain and refill the sump twice.It can when others can't,
It will when others won't,
It goes where others don't.
31st Mar 2018 8:58 pm
hutch1088
Member Since: 17 Mar 2018
Location: Newcastle upon Tyne
Posts: 7
he did recommend changing the oil but not to flush it
31st Mar 2018 9:15 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8171
The GB should be flushed with the same oil that is used in the GB, so there will be around 10ltr left in It can when others can't,
It will when others won't,
It goes where others don't.
31st Mar 2018 10:17 pm
hutch1088
Member Since: 17 Mar 2018
Location: Newcastle upon Tyne
Posts: 7
ok then if there is no flushing fluid involved a flush would be the best way to go
1st Apr 2018 9:06 am
pagoda
Member Since: 13 Aug 2009
Location: Not London Anymore (or the US for that matter)
Posts: 1928
Doing a self flush is not remotely difficult. Plenty of info on the site about how to do it. Having an IID tool would help with the temps, but if you were considering dropping the pan yourself, then doing a flush should be well within your capabilities.PAGODA
1st Apr 2018 2:23 pm
hutch1088
Member Since: 17 Mar 2018
Location: Newcastle upon Tyne
Posts: 7
bit the bullet booked it into Durham 4x4 to get done will let you know results
4th Apr 2018 7:28 pm
geoff.
Member Since: 24 Jan 2010
Location: West kent
Posts: 8531
what milage do u have
4th Apr 2018 10:37 pm
hutch1088
Member Since: 17 Mar 2018
Location: Newcastle upon Tyne
Posts: 7
Hi Geoff I,ve got 84000
5th Apr 2018 9:05 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72976
Mines at 48k, trying to decide whether to get it Megaflushed before after summer jolly when she’ll be up to 55k. Geoff, you got the gear? I’m assuming i’d have to leave the car with you for a while to let her cool down?
5th Apr 2018 9:10 am
hutch1088
Member Since: 17 Mar 2018
Location: Newcastle upon Tyne
Posts: 7
Hi folks just got back from Durham 4x4. Got gearbox flushed, didnt think it would make much difference but it seams to be pulling away a lot better and just running nicer all round, got the transfer box done at the same time, £283.73 all in very happy.
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