Thread: ZF 8-speed transmission fluid?

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.

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.

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.

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