ZF 8-speed transmission fluid?

I know your background, so you likely know. I’ll post for others.

How it keeps seals supple is the same way putting Nitrile on brake fluid does - it attacks the rubber, making it cheesy.

It has no way of preventing heat from ageing the materials. Those compounds have a fixed operating scope. By softening the material and making it swell it keeps from taking a set.

If you’re happy with it, fine, just understand how it’s impacting a far more advanced transmission compared to the old Band and Oring BW job.

Clutch packs are a very different beast, tolerances are different, and the valving far more complex, including pressure monitoring.

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Originally Posted by Tombie

I know your background, so you likely know. I’ll post for others.

How it keeps seals supple is the same way putting Nitrile on brake fluid does - it attacks the rubber, making it cheesy.

It has no way of preventing heat from ageing the materials. Those compounds have a fixed operating scope. By softening the material and making it swell it keeps from taking a set.

If you’re happy with it, fine, just understand how it’s impacting a far more advanced transmission compared to the old Band and Oring BW job.

Clutch packs are a very different beast, tolerances are different, and the valving far more complex, including pressure monitoring.

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Point taken and I wholeheartedly agree with you.

I neglected to mention that I use the Wynns "Professional" range of products which I am told is a different formulation to that sold at many retail stores.
The Professional range is identified by being in black bottles and only available to workshops/service depts etc.
You won't see it at retail stores.

I buy it direct from local Wynns distributor due to my long association with them.

Normal retail Wynns is in the traditional purple bottles.

I have been assured the formulation in the Professional range is fine for current types ("modern") autos.

Back to the Penrite BMV for a moment, had an interesting conversation with the brother of my next door neighbour last weekend. He owns two large and highly respected w/shops in Hobart City Liverpool St and a big new one at Cambridge (near the airport) where he has 9 hoists (!!).

They are also Bosch Service Agents and service anything, but Audi & BMW seem to be popular.
They also do a few D3's, 4's and Range Rovers.

They exclusively use Penrite products and have been using BMV in the Audi's and BMW's as well as the LR/RR's since it was available, and have many customers cars with big mileage on them now.

Absolutely no probs whatsoever with Penrite BMV/ZF autos.
They also use the Wynns Professional products apparently.

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Originally Posted by Dagilmo

I agree, I've been a LG devote but as more time goes by the BMV is looking very good. Which is great.

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I think you'll find that those having issues with BMV are on high mileage and probably halfway to a new transmission anyway.

Hmmm, no transmission issues before or after switching to BMV for me.

Just worn valve body seals, solenoids and clutch valves. I think this happens regardless of fluid type or brand.

The LR "sealed for life" is BS, we all know that.

In my view (and its mine, only based on my observations) LF fluid is great, but expensive for what it is. BMV is also great, but not so expensive. If its good enough for BMW, Audi and other car makes, and penrite tells me its good for the ZF transmissions, good enough for me.

Oh, and ~65,000km of real life road testing on this stuff with 0 problems has helped a bit as well.

Not derating LF at all, great stuff, i just think be smart where you spend your hard earned (maybe i should have thought about that before buying a LR....)