AW55 Auto Oil Change

[Jonathank]

Hi Everyone,

My C70 only has 36k on it but it's 12 years old so I've been thinking about an auto box oil change and researching what can be done.

A lot is written about 'sump dump' and I can see the logic behind it but it's a bit of a process.

An alternative seems to be to use a machine which takes the in and out pipes from the oil cooler and replaces old oil with new as it's pumped through. Wynns do a machine you can see here https://www.wynns.eu/product/transerve/ but there are others out there.

My question is has anyone used or had an auto oil change using this or a similar system and if so, how effective was it and what did it cost?

On a separate note, has anyone tried this company http://www.autotransgloucester.co.uk/? They look like my kind of old school specialists and I might try them when the time comes.

Thanks as ever

J

[zapcity1]

I think the Wynn's machine is about £4K, so would take some time to pay back!

I used a local independant transmission specialist a couple of years ago for my C70 using a similar method. Was about £140 for a full change.

Sump dump is not hard (I do it on my XC70) but will only change a % of the ATF depending on how many 'dumps' you do. 50%, then 25%, 12.5% etc. diminishing returns.

A lot of owners do a dump at a set mileage (40K seems typical), so keeping 50% of the ATF fresh.

A full change will always be the better option, and gives you peace of mind for many miles.

I guess at 36K you might not need a change. CLAN could probably advise if the ATF degrades over time.

[Jonathank]

This was another product that does the same thing. Informative video. https://youtu.be/QgXddmFo00A

[XC90Mk1]

Originally Posted by Jonathank

Hi Everyone,

My C70 only has 36k on it but it's 12 years old so I've been thinking about an auto box oil change and researching what can be done.

A lot is written about 'sump dump' and I can see the logic behind it but it's a bit of a process.

An alternative seems to be to use a machine which takes the in and out pipes from the oil cooler and replaces old oil with new as it's pumped through. Wynns do a machine you can see here https://www.wynns.eu/product/transerve/ but there are others out there.

My question is has anyone used or had an auto oil change using this or a similar system and if so, how effective was it and what did it cost?

On a separate note, has anyone tried this company http://www.autotransgloucester.co.uk/? They look like my kind of old school specialists and I might try them when the time comes.

Thanks as ever

J

I am in the process of sump dumping mine. If you are going to use the gibbons method then there is no need to have an expensive machine you simply open the fill hole, add 2 liters and discharge 2l via the oil cooler and repeat.

I choose the sump dump for simplicity. I do however have 1 point of note. When undertaking the first dump the fluid was black. The 2nd dump was done a couple of hundred miles later and was still black.

I then did a test. I undertook a 3rd refill and powered up and held in P, R, N and D for 10 Seconds and dumped a small amount via the drain, it was a much better colour. I then drove that 200M and it was still black.

It is clear that the old 2S in each gear to circulate the fluid does not mix the solution. You are far far better of sump dumping at 1,000 mile intervals for example. The fluid has a proper chance to mix and the fresh fluid also rapidly picks up contaminants. I am sure that the prescribed sump dumps are only really clearning out the front end (sump) and not the gear internals.

I really believe that for ultimate protection dump the 2.6l out when undertaking an oil change every 6 months and refill with 2.6l. There is little point putting in fresh fluid and dumping it immediatly as it does not mix or pick up contaminants like been left in for even a hundred or two hundred miles.

[cheshired5]

When I do this, I put the front end on axle stands and actually drive the wheels through all the gears.
This seems to mix it well and freshen the fluid up considerably all within the same "session" and without having to drive xxxx miles in between sump drains.

It usually takes around 4-5 drain and fills to transform manky fluid to cherry red dependant on original condition.

Safety is of course paramount using this method so don't even attempt it unless you're certain there'll be no mishaps and if it's AWD, the rear needs to be on axle stands too.

[XC90Mk1]

Originally Posted by cheshired5

When I do this, I put the front end on axle stands and actually drive the wheels through all the gears.
This seems to mix it well and freshen the fluid up considerably all within the same "session" and without having to drive xxxx miles in between sump drains.

It usually takes around 4-5 drain and fills to transform manky fluid to cherry red dependant on original condition.

Safety is of course paramount using this method so don't even attempt it unless you're certain there'll be no mishaps and if it's AWD, the rear needs to be on axle stands too.

Chrikey, could you imagine how funny that would be should you jack up the front end and the AWD kick in!

Good point!