C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ZF-6 Fluid Recomend

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Old Jan 11, 2004 | 11:17 PM
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Default ZF-6 Fluid Recomend

recomendations on Fluid for my ZF6 on my LT4... 78,500 miles on it.. and the rear end as well.. im thinkin i might as well change them
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Old Jan 11, 2004 | 11:48 PM
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Default Re: ZF-6 Fluid Recomend (CaliforniaVette)

I used Gm syncromesh manual trans fluid

It worked GGGGRRRRREAT

Almost forgot to add I have a Richmond 6 speed


[Modified by ffvetteman, 4:49 AM 1/12/2004]
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Old Jan 12, 2004 | 12:33 AM
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Default Re: ZF-6 Fluid Recomend (ffvetteman)

Richmond 6spd is the T56 correct? used on the F-bodies?
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Old Jan 12, 2004 | 01:09 AM
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Default Re: ZF-6 Fluid Recomend (CaliforniaVette)

http://www.zfdoc.com/index.htm
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Old Jan 12, 2004 | 01:42 AM
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Default Re: ZF-6 Fluid Recomend (ffvetteman)

I used Gm syncromesh manual trans fluid

It worked GGGGRRRRREAT

Almost forgot to add I have a Richmond 6 speed
You're making recomendations on fluids, even though you don't have a ZF6??? :confused:

Either use the factory ZF6 fluid from GM, or use the Castrol which you can buy from the BMW dealership.
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Old Jan 12, 2004 | 01:43 AM
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Default Re: ZF-6 Fluid Recomend (CaliforniaVette)

Richmond 6spd is the T56 correct? used on the F-bodies?
The T56 is Borg Warner and later, Tremec.
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Old Jan 12, 2004 | 02:57 AM
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Default Re: ZF-6 Fluid Recomend (CaliforniaVette)

When I change my 96's, I am going to use what is specified in the owners manual. I have always used the GM lubricant in the rear end of my 70 since it was new and it has 160K on it now with no known problems using GM lubricant. I always change my own.
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Old Jan 12, 2004 | 09:54 AM
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Default Re: ZF-6 Fluid Recomend (CaliforniaVette)

I used the BMW synthetic oil recommended by ZF for the tranny. It shifts smoother than the GM stuff IMHO. :thumbs:
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Old Jan 12, 2004 | 10:08 AM
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Default Re: ZF-6 Fluid Recomend (GS919)

I used the BMW synthetic oil recommended by ZF for the tranny. It shifts smoother than the GM stuff IMHO. :thumbs:
:iagree:
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Old Jan 12, 2004 | 11:17 AM
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I used the BMW synthetic oil recommended by ZF for the tranny. It shifts smoother than the GM stuff IMHO. :thumbs:
:iagree:

The GM stuff felt a little "notchy" but the BMW stuff makes it smooth as silk.
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Old Jan 12, 2004 | 07:52 PM
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Default Re: (Professor)

so is the BMW oil only at the dealer?
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Old Jan 12, 2004 | 08:02 PM
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Default Re: ZF-6 Fluid Recomend (froggy47)

<A HREF="http://www.zfdoc.com/index.htm" TARGET="_blank"> http://www.zfdoc.com/index.htm</A>
Call Bill at the above site. He will send the BMW fluid to you.
Good stuff !
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Old Jan 12, 2004 | 08:33 PM
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Default Re: ZF-6 Fluid Recomend (FrankUrbinati)

You can get the BMW fluid at any BMW dealer, tell them you are a club member and it's about 50% off.

It made my 90K mile ZF6 shift much, much better, and the effect has lasted 2-3 months so far.

Jeff
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Old Jan 12, 2004 | 09:06 PM
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Default Re: ZF-6 Fluid Recomend (no_radio)

You can get the BMW fluid at any BMW dealer, tell them you are a club member and it's about 50% off.

It made my 90K mile ZF6 shift much, much better, and the effect has lasted 2-3 months so far.

Jeff
50% off!!! what? a club member... of this forum or of an actual vette club.
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Old Jan 12, 2004 | 09:25 PM
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Default Re: (Professor)

I used the BMW synthetic oil recommended by ZF for the tranny. It shifts smoother than the GM stuff IMHO. :thumbs:
:iagree:

The GM stuff felt a little "notchy" but the BMW stuff makes it smooth as silk.
Let's compare apples to apples. If you have the GM stuff and it's old, when you remove it and refill with Castrol (BMW stuff) of course it's going to feel better. So will the GM stuff when it's new. Both will work just fine.
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Old Jan 12, 2004 | 11:10 PM
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Default Re: (Strick)

I used the BMW synthetic oil recommended by ZF for the tranny. It shifts smoother than the GM stuff IMHO. :thumbs:
:iagree:

The GM stuff felt a little "notchy" but the BMW stuff makes it smooth as silk.

Let's compare apples to apples. If you have the GM stuff and it's old, when you remove it and refill with Castrol (BMW stuff) of course it's going to feel better. So will the GM stuff when it's new. Both will work just fine.
Actually, I was comparing apples to apples. Sorry I did not explain.

When I first got my 90 it had a little grinding in 3 and 4 so I replaced the fluid with GM stuff. I do not think the previous owner ever changed it in 125K so there was an improvement but it was not much. I was underwhelmed.

After 10k miles I switched to the BMW stuff and it showed an immense improvement. The only downside it that the tranny is a little more stiff in the mornings (Garage is 20*F most of the time).

Sorry for the confusion.

Dale
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Old Jan 12, 2004 | 11:19 PM
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Default Re: (Professor)

Stick with the BMW juice. I filled mine with REDLINE MTL "blue martian blood" and it about killed my ZF.It would not go into 3rd or 4th half the time.I switch it out and ran BMW/CASTROL now it's back to normal.IMHO the redline has to many additives.You can't even see though it when you pour.It might be great in some trannys, but I think the ZF has alot tighter tolerances.Learn by my mistakes!! :cool:
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To ZF-6 Fluid Recomend

Old Jan 13, 2004 | 12:07 AM
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Default Re: (SPEED750)

Thanks everyone, I emailed Bill at ZFdoc and he got back to me right away with some great tips!
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Old Jan 13, 2004 | 10:20 AM
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Default Re: (CaliforniaVette)

Thanks everyone, I emailed Bill at ZFdoc and he got back to me right away with some great tips!
So what were the tips? No secrets here. :thumbs:
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Old Jan 13, 2004 | 10:38 AM
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Default Re: ZF-6 Fluid Recomend (froggy47)

Interesting tidbit I got off that site...

The ZF S6-40 6-speed transmission is lubricated by engine type oil. Manufacturer recommendations specify the use of GM P/N 1052931 (5w-30) or BMW P/N 07510009420 (10w-60) oil.

Approximate oil capacity of the ZF S6-40 is 2.2 quarts.
So the GM stuff is 5W-30 and the BMW stiff is 10W-60??? That seems like quite a spread to me on viscousity levels for the same trans... :confused:

Looks like I'll be going by the BMW dealer though and picking up the "good stuff"... :lol: That'll be one of the first projects when I get the LT4 home this week... :yesnod:
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