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Thread: Auto box flush - anything to watch out for?

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    Senior Member Winchester12g's Avatar
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    Auto box flush - anything to watch out for?

    The car will be going to Neil Smith in Cannock soon for a full flush. Has anybody used this place?

    Is there anything I need to watch out for, specifically are there any potential downsides that CAN happen afterwards? My fear is that something will be thrown out of sync which will affect the drive.

    I think I'm right in saying that it's not as straightforward a job as replacing the manual box oil in a 1976 Cortina!
    1. I'll leave this link as a reminder to me of My First Love: http://www.jaguarforum.com/showthread.php?t=77370
    2. My beautiful 2007 X-Type 2.5 Estate (with a mid-sport exhaust) in metallic Quartz Grey was written off in Nov '17 thanks to a moron kid in a Fiesta who thought it'd be a good idea to pull off Mummy's drive with a totally misted up screen.....
    3. My new love is a pristine 2003 XJ6 X350 3.0 auto

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    Senior Member fat controller's Avatar
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    I read something the other day (sorry, cannot remember where) that suggested that flushing auto-boxes is just about the worst thing you can do to them. The advice was to just replace the oil and the filter, but not to use any flushing oils/fluids. Not sure if that applies to our cars though.
    ex - 2002 X-Type 2.5 V6; 1995 XJ Sport 3.2; 1998 Mercedes C180 Elegance; VW Passat 2.0TDI (140); Audi A4 Avant 2.0TDI; Nissan Qashqai 1.5dCi; Current - 2007 XJ 4.2 V8 Sovereign, and occasionally an Electric Wheelchair!

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    Senior Member Winchester12g's Avatar
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    Quote Originally Posted by fat controller View Post
    I read something the other day (sorry, cannot remember where) that suggested that flushing auto-boxes is just about the worst thing you can do to them. The advice was to just replace the oil and the filter, but not to use any flushing oils/fluids. Not sure if that applies to our cars though.
    That's food for thought, thanks.

    Being a non-mechanic I just assumed that a flush would either be required or the best way forward. I'll definitely have the conversation before I go ahead....
    1. I'll leave this link as a reminder to me of My First Love: http://www.jaguarforum.com/showthread.php?t=77370
    2. My beautiful 2007 X-Type 2.5 Estate (with a mid-sport exhaust) in metallic Quartz Grey was written off in Nov '17 thanks to a moron kid in a Fiesta who thought it'd be a good idea to pull off Mummy's drive with a totally misted up screen.....
    3. My new love is a pristine 2003 XJ6 X350 3.0 auto

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    If you don't flush, you're leaving the old fluid in the torque converter. A flush replaces 98% of the old fluid throughout the box and converter.

    Quote Originally Posted by fat controller View Post
    I read something the other day (sorry, cannot remember where) that suggested that flushing auto-boxes is just about the worst thing you can do to them. The advice was to just replace the oil and the filter, but not to use any flushing oils/fluids. Not sure if that applies to our cars though.
    2003 Jaguar XJ8 (X350) 4.2 Silver
    2006 Jaguar XK (X150) 4.2 Indigo Metallic

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    Senior Member Winchester12g's Avatar
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    Quote Originally Posted by Thomas Hayward View Post
    If you don't flush, you're leaving the old fluid in the torque converter. A flush replaces 98% of the old fluid throughout the box and converter.
    Thanks Thomas....
    1. I'll leave this link as a reminder to me of My First Love: http://www.jaguarforum.com/showthread.php?t=77370
    2. My beautiful 2007 X-Type 2.5 Estate (with a mid-sport exhaust) in metallic Quartz Grey was written off in Nov '17 thanks to a moron kid in a Fiesta who thought it'd be a good idea to pull off Mummy's drive with a totally misted up screen.....
    3. My new love is a pristine 2003 XJ6 X350 3.0 auto

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    personally, I don't think that I would flush.....

    reason being that the correct fluid is very, very expensive and I can see a garage using and essentially wasting the correct Lifeguars at £25 a litre or whatever it is. I'd say the risks of a flush with non-correct fluid outweigh the risk of leaving the torque converter fluid in.

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    Had mine flushed about 6 weeks ago using the life guard 6 stuff , gearbox as now seamless changes it wasn’t bad before just a preventative measure, had no problems so far.
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    Senior Member FastEddie's Avatar
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    Its one of those topics with mixed opinions and you will just have to decide yourself which is the best route to take.
    This, along with fluid and compatibility discussions have been quite exhaustively covered if you search a few threads.

    I'm completely against flushing, the gearbox itself has a perfectly good internal gear pump / filter mesh in the sump.
    I replaced my sump and oil as i had the use of a lift locally, then drained and replaced the oil again 6 months later.
    No issues, what came out mixed with the remaining few litres in the torque converter was not noticeably different.

    Changing the flow of a hydraulic system can move settled debris in to a place that will bring about major problems.
    Auto boxes don't really have the proportional hydraulics i am referring to, none the less the same can happen.
    Flushing is one of those things that obviously can make good improvements, but can also have adverse affects too.
    2009 X358 LWB 2.7 Tdvi , Liquid Silver , 125k+ and going strong ......



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    Senior Member Partick the Cat's Avatar
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    It all depends what you mean by 'flushing'.

    If you mean running a large quantity of thinner-than-normal fluid through the transmission, in the same manner as flushing an engine with flushing oil, then that would seem a bad idea.

    However the term flushing is used in a different sense when it comes to the 350's transmission, and others. Simply draining the transmission and filling with fresh fluid only changes roughly half the fluid; the rest is held up inside the torque converter, the cooler and the lines to it - and that doesn't drain out, it has to be pumped through.

    The term flushing in this case refers to pumping fresh fluid through the TC etc, and diverting the return line from the cooler so the old fluid doesn't get back into the body of the transmission. That obviously needs a method of simultaneously adding fresh fluid to the body of the transmission as the old fluid is being dumped.

    'Active draining' might be a better name for the process, instead of 'flushing'.

    There are, I believe, machines that transmission specialists have that can do this ... or ... you can DIY as Don on the US jagforum has just recently posted up ...

    https://www.jaguarforums.com/forum/x...sh-diy-217150/
    Last edited by Partick the Cat; 15-05-19 at 13:00.
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    Member alan@agilecomputers.co.uk's Avatar
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    Just recently had my ZF auto box flushed and refilled using the Launch CAT501S machine that Patrick eluded to. There's a whole thread devoted to this topic here:

    https://www.jaguarforum.com/showthread.php?t=95585
    XJ Sovereign 2.7 TDVi, January 2008, Indigo Blue Pearl

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