What’s your opinion on gearbox servicing? Should I get a mega flush done on my 4.2 supercharged or just drop the oil and new filter? I can’t decide which route to go tbh guys

i will do oil and new filter on mine @ 60ish K same as i did on the last one. my reason being i dont want all the deposits being cleaned off the components in the box and then floating about causing problems later with the new detergents cleaning everything. Cheers

James

When flushing, detergents should not be used with the 6/8HP boxes...

Had my 8 speed megaflushed by Bodsy a few months back as a precautionary maintenance. All fine. He didnt use any detergents or Dr Tranny just 8 speed oil  Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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👍🏼 Where is he based please

Mobile out of Shropshire.
www.updatesbybodsy.co.uk Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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Don’t think he would come all way to me though lol

He goes all over. Text him. Mobile on contact us page of his website Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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Andyschargedse wrote:

Don’t think he would come all way to me though lol

JAS Land Rover is in York, and capable of flushing the 6 and 8 speed boxes

This is the best explanation I can find of flushing versus drain/refill

Quote:

do an experiment, take a 500ml drinks bottle fill it with water and add 10ml of blue food colouring, the water is the good fluid the food dye is the contaminants.
It should be a deep blue now,

Pour half of it away and add 250ml of water.... what colour is the liquid in the bottle?

now do it again,

And again,

And again,

each time you do it, youre changing a percentage.... the first time 50%, the next 75%, 87.5%, 93.75% 96.88%, the official figure for out equipment is 98%.... and we didnt use £1100 worth of fluid to get it....

imagine that’s 7litres of £30 per litre fluid everytime you do it... and the fluid is still dirty and contaminated, and you’ve spent £850 on fluid.....
The flush procedure is as effective as changing half the fluid 5times, all in one go using half the amount of fluid.

(Prices based on an 8 speed ZF, but the basics are the same)

I was always told that the best method was to drop the oil and replace. Do a couple of hundred miles then drop the oil again, remove the sump, replace the filter and refil.

Just to add my tuppence worth :
If you look at the ZF documentation, they recommend an oil & filter / pan change NOT flushing.
It doesn't necessarily mean they're against flushing, but all of their gearbox durability / life testing will have been based on their recommended method of servicing at their recommended intervals.
Flushing done well, obviously works.
Flushing done badly I'm sure can do harm.
A "standard" auto transmission oil & filter change is hard to mess up, other than incorrect amount of oil put back in, but that should be manageable if you've got the "skills" to get the car in the air safely. Paul,
2001 Discovery 2 TD5, 211,000 miles & climbing
2006 FFRR TDV8 Vogue 151,000 miles & now sold
Member of Midland (Land) Rover Owners Club, www.mroc.co.uk

Last edited by Pawl on 5th Jun 2019 9:37am. Edited 1 time in total

As ever, make your own mind up with the evidence presented
For me, a lot of very experienced LR mechanics like Mikey and Bodsy etc offer a professional Megaflush service. That's enough for me as a knowledgeable enthusiast If they need advice from a Chartered Biologist then I'm their man  Gone to a good home: 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
2025MY Defender D350 90 in Silicon Silver on coils
1974 Series 3 Lightweight = "Millie"
Many, many other Landies over the years
My preferred specialist: www.glenrands.co.uk
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