Hi guys I did drain about 3 liter about month ago and refill about 5 liter the transmission was on limp mode but after the drain and refill its working fine but there's burnt smell and my mechanic friend say it's probably burnet clutch
anyways I'm thinking to remove the pan and install new filter and new fluid ist good idea or it might be worse ?
And yes I didn't use the zf fluid I had box of mercon lv and it works fine now 1 month no problems
But now I have amsoil multi atf fluid I got a box for 30$ my friend didn't need them

 

What? You mean you didn't buy Mobile 1 brand ATF? After so many years and miles, I think as long as its a compatible type. No longer worried Jaguar could use your choice of fluid to weasel out of a warranty claim, besides, their engineers fully intended you scrap the car at 100K and buy a new one. There's probably a long list of specification numbers on the back of the bottle that its compatible with or may have to find it online. I think I used Valvoline last time.

 

I am not sure I would have replaced the original fluid. You can always add
some sure, and especially when you are that low. Personally, I would not
even consider anything but the lifeguard for the Duchess.

 

The amsoil multi ATF is compatible with lt71141
But I had luck with mercon lv
If the smell continued I think I will pull the pan because this or that way I feel the transmission will go away I hope and pray not to because it cost to replace it .

 

well I will keep driving it as is for now it's working fine but the smell it's definitely like burning clutches. I think fluid and filter won't do much at this point?

 

Hi mobile1,

The kinematic viscosity of ZF Lifeguard 5 at 40°C is 37 mm2/s. The KV40 of Mercon LV is just 28 - 32 mm2/s, so you have mixed a fluid that is too thin with your original fluid. And who knows if the additives in Mercon LV are compatible with those in Lifeguard 5? Fluidmakers only have to disclose ingredients that are toxic or hazardous, so we rarely have enough information to determine the compatability of all the additives.

The KV40 of Amsoil Signature Series Multi-Vehicle Synthetic ATF is 38.5 mm2/s, which is closer to that of Lifeguard 5, but Amsoil's claims about the vast number of transmission fluids it is equivalent to seems implausible. Many of the fluids to which it claims to be equivalent are Dexron III type fluids. And while ZF specifies Dexron III in the 4HP24 4-speed transmissions, it has never specified Dexron III for use in the 5HP24. So the ZF engineers must know someting about the characteristics and additives of Dexron III that is not optimal for use in the 5HP24.

The fluids we know to be correct in your ZF 5HP24 are listed below. In the U.S., I often find the best price on the Febi (check eBay and Amazon sellers):

ZF Lifeguard 5
ESSO LT 71141
Pentosin ATF 1
Febi Automatikgetriebeöl (ATF) Nr. 29738
VW/Audi G 052 162 A2
Ravenol ATF 4/5 HP

There is no reason to think that just because a transmission is old and has run a lot of miles that its fluid requirements have changed in some way that we can guess and correct with some different fluid of our choosing. And choosing our transmission fluid based on cost alone is not likely to result in optimal performance. One thing we have learned is that not all transmission fluids are equal and not all third-party fluidmaker claims of compatability are true.

Fluid-related transmission failures often take tens of thousands of miles to manifest, and the symptoms of sub-optimal performance can be subtle or unnoticeable. But running a fluid with incorrect viscosity, friction/slippage characteristics, anti-corrosion and anti-foaming additives, viscosity modifiers, etc. may have long-term catastrophic consequences. Your burning smell seems like a clue!

Since the transmission is the second-most expensive component in your Jaguar, why not use a fluid approved by the engineers who designed your transmission?

At this point, you probably don't need to do another drain and fill, you need to either replace all of your fluid, or rebuild your transmission, because your fluid is contaminated.

Cheers,

Don