Which oil in the gearbox ?

[EV2DEMON]

I don't know, but mine got worse with Pennzoil synchromesh.

Looks like I'll bite the bullet and drop the cash for the BMW stuff.

[Paul Workman]

Bill Boudreau @ ZFdoc.com recommends the Castrol TWS 10W-60 for the new ZF (that replaced the original one that locked up on me while cruising at 70 mph).

According to Bill, locking up is a problem not uncommon with the ZF - especially on a few of the 94-95 transmissions. This, according to what Bill told me, it is due to insuficient lubrication of the reverse gear where it spins on a shaft shared with 6th grear. He went on to tell me that as part of his transmission "blue printing" he routinely opens up the oil galleries that feed oil to that reverse gear. He recommends the procedure, but if I opted to forgo it to save a little money, he said to BE SURE TO USE THE CASTROL TWS. (I had him open the galleries and I use the TWS. That's my story an I'm stickin' toit!)

Oh, the ZF that froze up on me had 42,000 on it is all. I can't say what it had in it - oil wise - I bought that LT1 Vette with 38,000 mi. I suppose it would be reasonable to guess iit had the original oil in it.

One other thing is to check to be sure the oil level is full. It is easy to forget, so it's part of my annual get ready for spring driving season routine.

P.