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Ford ZF5 oil #4672491
02/20/18 10:09 PM
02/20/18 10:09 PM
Joined: Jul 2008
Posts: 2
Idaho
ajbranz Offline OP
ajbranz  Offline OP

Joined: Jul 2008
Posts: 2
Idaho
New here, I searched but got 0 results. 1992 Ford ZF5 specs atf-Mercon. Would a dedicated MTL provide better gear, bearing, and synchro protection than synthetic atf? After reading for hours on this Iíve considered Pennzoil synchromesh, redline MTL, and Amsoil mtf. Suggestions? Thanks

Re: Ford ZF5 oil [Re: ajbranz] #4672495
02/20/18 10:13 PM
02/20/18 10:13 PM
Joined: Dec 2012
Posts: 562
Cave City KY
jakewells Offline
jakewells  Offline

Joined: Dec 2012
Posts: 562
Cave City KY
Just use regular dex merc III or mercon v that is all you really need for that transmission.


1994 Ford F150 302 4R70
Chevron Delo SAE 30 CF/SL Fram XG8A

1978 Chevy Nova 250 I6 Borg Warner T5
Rotella 10W40 Fram XG5

Re: Ford ZF5 oil [Re: ajbranz] #4672498
02/20/18 10:14 PM
02/20/18 10:14 PM
Joined: Sep 2015
Posts: 2,559
Malaysia
zeng Offline
zeng  Offline

Joined: Sep 2015
Posts: 2,559
Malaysia
I would say you're good to go.
Any whining noise so far ?

Re: Ford ZF5 oil [Re: zeng] #4672585
02/21/18 12:01 AM
02/21/18 12:01 AM
Joined: Jul 2008
Posts: 2
Idaho
ajbranz Offline OP
ajbranz  Offline OP

Joined: Jul 2008
Posts: 2
Idaho
It whines in 1,2,and 3 gears like much older transmissions from the 50-60ís. It shifts fine other than 4 to 3 where I have to shift slow and or double clutch. Iíve got schaeffers 204 atf in it now.

Re: Ford ZF5 oil [Re: ajbranz] #4672612
02/21/18 12:51 AM
02/21/18 12:51 AM
Joined: Sep 2015
Posts: 2,559
Malaysia
zeng Offline
zeng  Offline

Joined: Sep 2015
Posts: 2,559
Malaysia
Whining noise is an indication of worn-out gear teeth profile from typically inadequate oil operating viscosity.
For mitigation pick one from post #1 with a higher [email protected]*C, you may not be able to reverse whining phenomenon though.

Re: Ford ZF5 oil [Re: ajbranz] #4672615
02/21/18 12:58 AM
02/21/18 12:58 AM
Joined: Nov 2013
Posts: 3,213
Kentucky
Ramblejam Offline
Ramblejam  Offline

Joined: Nov 2013
Posts: 3,213
Kentucky
Hello ajbranz, and welcome to the forum.

ATF never was an ideal choice for these transmissions; go directly to the source (ZF), who recommend their Ecofluid M product for the S5-42 (AKA, ZF5). This is 75w-80 MTF.

Red Line MTL is available over on Amazon.

Re: Ford ZF5 oil [Re: ajbranz] #4672621
02/21/18 01:21 AM
02/21/18 01:21 AM
Joined: Sep 2015
Posts: 2,559
Malaysia
zeng Offline
zeng  Offline

Joined: Sep 2015
Posts: 2,559
Malaysia
S5-42 requires ZF lubricant class 02B/02E/02L

... which includes MTF 75W90 and 75W85

Re: Ford ZF5 oil [Re: ajbranz] #4672697
02/21/18 06:49 AM
02/21/18 06:49 AM
Joined: Apr 2008
Posts: 13,200
Central NY
Miller88 Offline
Miller88  Offline

Joined: Apr 2008
Posts: 13,200
Central NY
I've towed 6500 pounds through mountains and used OD while doing it (where it could pull OD) with ATF and mine is fine apart from the ears breaking off.

The ZF5 I just picked up had original ATF in it at 300 K judging by the color.

The other thing is, this is the worst cold blooded pickup / light duty transmission ever. They just won't shift when the temperature is super cold. I have to leave it in gear idling with the transfer case in neutral for a few minutes. I can't imagine it would be better on 75w85


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
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