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#4672491 - 02/20/18 09:09 PM Ford ZF5 oil
ajbranz Offline

Registered: 07/16/08
Posts: 2
Loc: 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

#4672495 - 02/20/18 09:13 PM Re: Ford ZF5 oil [Re: ajbranz]
jakewells Offline

Registered: 12/28/12
Posts: 450
Loc: 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 3 on the tree.
Rotella 10W40 Fram TG30

#4672498 - 02/20/18 09:14 PM Re: Ford ZF5 oil [Re: ajbranz]
zeng Offline

Registered: 09/01/15
Posts: 2184
Loc: Malaysia
I would say you're good to go.
Any whining noise so far ?

#4672585 - 02/20/18 11:01 PM Re: Ford ZF5 oil [Re: zeng]
ajbranz Offline

Registered: 07/16/08
Posts: 2
Loc: 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.

#4672612 - 02/20/18 11:51 PM Re: Ford ZF5 oil [Re: ajbranz]
zeng Offline

Registered: 09/01/15
Posts: 2184
Loc: 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.

#4672615 - 02/20/18 11:58 PM Re: Ford ZF5 oil [Re: ajbranz]
Ramblejam Offline

Registered: 11/05/13
Posts: 3210
Loc: 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.

#4672621 - 02/21/18 12:21 AM Re: Ford ZF5 oil [Re: ajbranz]
zeng Offline

Registered: 09/01/15
Posts: 2184
Loc: Malaysia
S5-42 requires ZF lubricant class 02B/02E/02L

... which includes MTF 75W90 and 75W85

#4672697 - 02/21/18 05:49 AM Re: Ford ZF5 oil [Re: ajbranz]
Miller88 Offline

Registered: 04/09/08
Posts: 12701
Loc: Onondaga County
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 Cherokee
01 Ford F-350 XL 4x4 5M