D2 auto oil change

[shamirj]

hi all,

just replaced oil filter and oil (ATF) for auto and found the filter to be quiet filthy. but as previous when you remove pan and remove the ATF you only get 4 litres out not the full 8-9L. so after refilling approx 4L back and driving around, should i drain and fill another 4L to hopefully clean out the remainder of old oil now mixed with new. is this what others do when they do an oil change. thx

[OffTrack]

If it's filthy definitely drop the oil again. It's probably worthwhile letting the box run on the first refill for perhaps 400-500km. It might be worth replacing the filter with the second change if the fluid still looks dirty.

Because the new and old fluids blend together you need 4 or more drain/refills to get a high percentage of new fluid.

Assuming a 4lt drop the first drain/refill gives you 44.4% new. The second drain removes 44.4% of the new/old blend, so you only end up with 69% new fluid. It takes 4 drain and refills to get more than 90% new fluid in the box.

cheers
Paul

[twr7cx]

Assuming a 4lt drop the first drain/refill gives you 44.4% new. The second drain removes 44.4% of the new/old blend, so you only end up with 69% new fluid. It takes 4 drain and refills to get more than 90% new fluid in the box.

Personally I only do two changes at a time, as that gets almost 70% of the old fluid out. Beyond that it's very marginal benefits (especially for the high cost of Transmax Z fluid) - your starting to drain out more of the new fluid than the old.
I then rather do another two changes more regularly in order to ensure that even the old fluid in their is not that old...

But, if my fluid was coming out burnt or all dirty and that I would definitely keep changing and driving for a while until it's all clean.

[OffTrack]

Personally I only do two changes at a time, as that gets almost 70% of the old fluid out. Beyond that it's very marginal benefits (especially for the high cost of Transmax Z fluid) - your starting to drain out more of the new fluid than the old.
I then rather do another two changes more regularly in order to ensure that even the old fluid in their is not that old...

But, if my fluid was coming out burnt or all dirty and that I would definitely keep changing and driving for a while until it's all clean.

Absolutely agree. Once you have known good fluid I would do a single drain/refill every 12months/20,000km if you were being finicky. Changing on that basis will keep 70% of the fluid less than 2 years old. I'm sure with Transmax you can afford to run a lot longer between changes.

[Robgw]

How often should this be done?
My 2001 d2 had this done in 2007 with Filter and I did it again with filter 5 months ago.

Service say only do the filter once, but for the sake of $80 may as well change it too...

I do only 5k a year, very small K's.

[OffTrack]

The service schedule for fluid changes is 40k km/24months for normal usage. The arduous schedule everyone follows for engine oil changes also recommends transmission fluid changes at 20k km/12 months.

I can't imagine you'd need to do changes any more frequently than 24 months intervals if you do 5000km a year.

Cheers
Paul

[Trippy]

I watched a video of someone on youtube who said that it can be risky to change the auto trans fluid since sometimes the transmission will fail shortly after. Is this BS?

Anyway, I have no idea when the fluid and filter was changed on my 1999 D2 V8. And there is no dipstick to check colour and level right? I found a video on youtube of someone changing filter and fluid on a D2. Is this the correct way of doing it?:

How To Change Land Rover Transmission Fluid - YouTube

[SiddersC]

The flushing of the system can release particles into the system, trans fluid has good cleaning properties
If you are doing a staggered change over numerous drains and fill you should be ok

[schuy1]

That video is pretty much how it goes. It is pretty straight forward, although if changing the filter too check the O-Ring on the filter to valve block does not go askew as it only sits on the flange with no lip to hold it there. Mine was half off and crimped when I did my own first change :o and it had been done in a reputable workshop! Use a quality torque wrench as it is all alloy and SMALL bolts. As Offtrack says 12mths do a change. The theory that a fluid change causes failures is BS! If it fails it was going anyway or they used wrong fluid! 2 changes in quick succession is good if it has not been done for a while but fluid color is a good guideline. Brown=Bad, Black = very bad!
I attach a pic of my 2nd change color as per my auto thread else where on here, still going to do 2 more yet. That is 600 kms , the previous was the first in 20000( The change before I got it)









Cheers Scott

[OffTrack]

The theory is that if an auto hasn't had the fluid changed in a long time - like 80K, 100K or even "never" there is potential for the detergents and cleaning agents in the new fluid to loosen built up gunge, which can then potentially block passageways in the valve block causing failure.

So it isn't BS but the chances of it happening are low providing your Auto hasn't been badly neglected.

The auto in mine started slipping when cold about 18 months ago, I'm fairly sure the fluid hadn't been done for 50K km at least and after a filter change and two fluid changes the auto shifted beautifully. Which reminds me I really need to change the fluid soon. :angel:

cheers
Paul

[northiam]

I have been draining and adding new ATF (dextron 3) three times since replacing the filter and gasket etc. Once the fliud is all clean (nice pink) then start the same with the good ATF like Transmax z. :)

[OffTrack]

I have been draining and adding new ATF (dextron 3) three times since replacing the filter and gasket etc. Once the fliud is all clean (nice pink) then start the same with the good ATF like Transmax z. :)

Apparently the best way to do it, although I haven't attempted, is to remove the trans cooler return line and let the Auto pump the old fluid out while you fill with fresh. There is a post buried in the D2 section by a denizen of the forum who uses this method:

http://www.aulro.com/afvb/discovery-2/157065-advice-drain-atf-via-cooler-pipes.html#post1742387

It's probably worth considering rather than doing 3 fluid drops with Transmax Z :eek: At $75 per 4lt pack that would have to inflict some serious wallet damage.

cheers
Paul

[schuy1]

I have a feeling that if an auto has not had a fluid change in many thousands of kms there will be many underlying issues and the fluid change is just 1 catalyst on the downhill slide! :D Its gonna die which ever way its shot!
Having said that but, I do feel that the change from D3 to valvoline synthetic that happened in the service b4 I acquired the car has contributed to the probs Im having now through cleaning all the old gunk off into the oil. Nothing else could really explain why the oil is so dirty in so short a time.
Cheers Scott