It comes down to experience, at the end of the day

However, an adaptive reset is part of some ZF diagnostic procedure (on the 6HP box)

ok so the megaflush element changing all the fluid is a good thing but not without the filter being changed too. So the real question is, do you change the filter first and then get it flushed (pushing lots of bad fluid through a new filter) , or get the flush done first (pushing new fluid through an old filter) Current Vehicles :
L322 2010MY TDV8 Autobiography
BMW E38 735i
BMW E63 645ci

The filter isn't really a filter. It's a coarse bit of gauze/foam, to take big lumps of debris out of the oil

Even ZF don't call it a filter

The issues arise with old, dirty, contaminated oil, which essentially turns into a grinding paste. Much better to have a flush,mthan just a filter change

i suppose you flog megaflushs then Mikey ...


in all my previous cars ,about 42 years worth, i never had any gearbox oil's changed and definitely never had a gearbox flush ....and in all that time they worked fine..

however , i did have Craig change the oil and filter in my current FF as a pro active maintenance measure and my opinion is that if you change the oil then change the filter , as you do when you change oil in the engine..

i've never heard of anyone changing engine oil without replacing the filter, so it makes sense to do the same with the gearbox...

flushing the gearbox is a kinda job that doesnt make sense but it seems like a money maker for garages.. ... - .- -.




Y. O. L. O.
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My view is this (as regards the ZF 6-speed):

> Changing the gearbox oil is essential to prolong it's life. There are more and more failures occuring due to lack of maintenance thanks to the ridiculous LR service schedule of 150k/10 years. ZF recommend it at 50-75k or sooner with arduous use.

> A flush changes the most oil, being most important if time is catching up, but maybe less so if done earlier.

> The filter is rarely important because if it is dirty, the box already has big issues. As said, it does little in the way of filtering anyway.

With this in mind, I'd suggest that the filter not be bothered with until the service schedule (at least) and that since a power flush changes the most oil, then if the filter is not to be changed it makes sense to use it rather than pay for the extra labour of a manual fluid change instead (unless one is able to go down the DIY route on a regular basis as I shall be doing).

That's how I see it; YMMV.  Visiting from DISCO3.CO.UK
Discovery 3 TDV6 Auto HSE Zambezi Silver

you disco3 boys stick together then....  ... - .- -.




Y. O. L. O.
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Yep, but be assured it's not for any personal reasons.  Visiting from DISCO3.CO.UK
Discovery 3 TDV6 Auto HSE Zambezi Silver

Quote:

flushing the gearbox is a kinda job that doesn't make sense but it seems like a money maker for garages.

Sounds to me like there is a case for both......

Changing whatever % you can on a more frequent basis is one method.

However, changing the majority in one go (megaflush) is an equally valid option.

The filter / strainer replacement question seems to depend on which of those words you use to describe the device.

If I was planning to keep a car for a long time, I would get the gearbox oil changed with every major service - if I bought a reasonably high miler with an unconfirmed history, then a megaflush would make sense to me.

As above.

There is a significant amount of oil left in the transmission if it is changed the basic way, which is more important if it's been left longer. If you've hit 100k without a fluid change, a flush will give a much lower average age of the ATF. Even a double change can't match it because so much is left each time.

A flush also negates all but a level check under the car, so the labour saving counteracts the equiptment cost. It's very convenient also that the likes of Mike and Geoff can travel to you and have it done in an hour or so (and then the transmission doesn't have to be left to cool either).

It's important to remember that something like a 50k interval is fine first time round, but the average still creeps up. That's why a flush is useful to gain extra ground even at a lower mileage. I'll be doing annual (~20-25k) changes on my box from now on but I'll probably look to have a power flush again after 3 or 4 years (assuming it's still going strong) just to knock back the average further again.  Visiting from DISCO3.CO.UK
Discovery 3 TDV6 Auto HSE Zambezi Silver

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can someone on here TAKE A FEW PICTURES of

Before - what color the oil is ( running out of a jar into a tub )

and

After - what color the oil is ( running out of a jar into a tub )

based on a average mileage say 90K or so.......

TDV8 at 63k miles before flush...

Quote:

Look at it this way - Change it often - every 50K - its the same thing as flushing - FACT

someetimes you can be led up the garden path !

50k is the service interval as stated by ZF, and also states that a FLUSH is due.

A simple drain and refill removes approx 4.5 litres of oil, around 1/3 of the capacity of the gearbox

In no way, shape or form, is a drain and refill or even a "double flush" is the same as a power flush

Inside the strainer within the sump pan
Removed from a 4.2 SC with 95k miles

Er! The "coarse" strainer doesn't look that coarse! Previous cars:
S-Max 2007-2013 (only diesel I've had, good car but expensive when diesely bits go wrong, so what's the point?)
Galaxy 2001-2007
Mondeo Estate 1997-2001
Sierra Estate 1993-1997
Uno Turbo 1987 -1993
Fiesta 1984 - 1987
Fiat 127 1982 - 1984

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Quote:

A simple drain and refill removes approx 4.5 litres of oil, around 1/3 of the capacity of the gearbox

In no way, shape or form, is a drain and refill or even a "double flush" is the same as a power flush

Mikey - TOP MAN

Thank you for taking the time & trouble to upload pictures

OK - I Totally agree with you - and you sure know what your doing.

What I cant get my head around is that LR UK - service all my cars - only do for £700 a drain & fill !!!!!!!!!

Is the oil that expensive - if LR did a Flush as you say - and I think you have a valid point then you are talking about over a £1000 !

Are we saying that you can do all this "at Home"

now I read in the workshop manual that when refilling the gearbox the temperature needs to be at running temp so not to over fill

Or

is it a case of filling up with ( WHAT COMES OUT - MEASURE & PUT BACK IN WHAT HAS COME OUT.

Now there's not too much I don't know about car maintenance - but this thread has got me so confused

In a nut shell- I totally now see where everyone is coming from

WHAT I CANT SEE AND UNDERSTAND - IS WHY LR UK - SERVICE PLAN DOES NOT LOOK AFTER THE GEARBOX OIL IN THIS WAY
The Range Rover is their TOP SELLING BEST VEHICLE

If after what your saying ONLY 33% COMES OUT with a Drain !

But Once again - Thank you Mickey - really appreciate all you have said & done


I THINK EVERYONE ON HERE NEEDS TO COME & SEE YOU AND GET THERE'S DONE PROPERLY !




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