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Interesting experience with 6HP26 transmission flush

XK / XKR ( X150 ) 2006 - 2014

Interesting experience with 6HP26 transmission flush

Old 03-30-2019, 09:13 AM
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Default Interesting experience with 6HP26 transmission flush

Ten years old and under 60K miles decided it was time to finally try a transmission flush. Note there were no known issues but for peace of mind and considering I track the car almost exclusively now, I figured this would be just another part of the new maintainance routine.

At first I was going to buy 20 litres of LifeGuard6 fluid for just over $400 and have a friend borrow for a small fee a flushing machin but decided to ask the nearest main dealer if they offered the service and if they used Jaguar fluid. The advisor confirmed they offered the service, of course used Jaguar fluid and charged less than $300. Well that seemed to be a no-brainer! So I booked the appointment and had them do it.

All seemed well at first until I found a large pool of red fluid under the car the following morning. I promptly re-visited the service department and was told the sleeve was leaking, of course. I questioned the advisor about the color of the fluid as I was under the impression Jaguar/ZF fluid was a light golden color. He looked puzzled and said that Jaguar fluid has always been red and no other color.

For less than $100 for a new ZF pan and sleeve overnighted from FCP, I had them perform the labor for $400 (their rate is nearly $200 per hour) and spoke with the technician about the fluid color. He informed me they haven't used Jaguar fluid in over 10 years and they believed the whole idea of proprietary fluid to be a joke. He said they use BG transmission fluid that meets the specification for ZF/Jaguar and have never had a problem.

My impression so far after over 300 miles is I can tell no diference. Still salty about the advisor’s lie though.

Last edited by jahummer; 03-30-2019 at 10:05 AM.
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Old 03-30-2019, 09:33 AM
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Interesting indeed Jeremy. Long ago I was definitely in the camp of only using OEM liquid gold and that's what I've used on my last (actually only) two drain and fills.
Certainly there's been the warranty rationale for keeping with Lifeguard and then we've heard from Techs on this forum that the TCM software is tuned specifically for the fluid specs.

Subsequent findings have shown Mercon SP to have the exact same properties as Lifeguard. I've also read Pentosin (sp) meets the spec. Then lastly, there are guys on the X350 forum who've used Mercon and never had an issue either. Any debates on the topic can be found in BMW, Audi, Hyundai forums as well.

But you also take your car out on the track and still see no difference. While I'm not familiar with BG, you are so we can add that to the list.

If and when the time comes for another drain and fill, I'll be doing a full flush instead and with Mercon SP.
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Old 03-30-2019, 10:13 AM
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I think the use of manufacturer fluids is more about variable control than anything else. Unless specific data is cited to justify the use of a fluid, any major brand fluid that meets the specification should be sufficient for the application.

BG dealer products have been around for sometime and provide an automatic extended warranty for the parts they are used in. So now I have $2k warranty coverage for the transmission. Some years ago I had a differential self destruct on a truck that was 1k miles passed warranty and BG covered the entire cost even though it was a defect and had nothing to do with the fluid.


Last edited by jahummer; 03-30-2019 at 10:23 AM.
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