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89 Dakota Manual trans fluid change. #4484179
08/09/17 10:41 PM
08/09/17 10:41 PM
Joined: Dec 2016
Posts: 9
Lincoln, NE
kafka45 Offline OP
kafka45  Offline OP
Joined: Dec 2016
Posts: 9
Lincoln, NE
Ok.. its time to do a Manual transmission,(an NP2500), fluid change on this beast
The 89 Service manual says to use 10-30 oil. I feel stupid asking, but is this the
way to go 28yrs later? takes 2 qts. and I'm assuming a full synthetic is ok..

appreciate the feedback..

k

Last edited by kafka45; 08/09/17 10:50 PM.

Timing is EVERYTHING.
Re: 89 Dakota Manual trans fluid change. [Re: kafka45] #4484186
08/09/17 10:59 PM
08/09/17 10:59 PM
Joined: Dec 2011
Posts: 4,759
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,759
North Carolina
10W-30 would of course be fine, whether you choose conventional or synthetic. You could also run an MTF or a GL4 75W-90.


"Zed's dead baby, Zed's dead."
Re: 89 Dakota Manual trans fluid change. [Re: kafka45] #4484189
08/09/17 11:10 PM
08/09/17 11:10 PM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
I ran Mobil 1 10w-30 in my 84 Civic wagon 5-speed. It was spec'd for 10w-30 dyno oil and I thought this synthetic oil would be better. I found out that although engine oil is the correct viscosity it shears down too much. I rebuilt the transmission at 200K because of bearing noise. I replaced the bearings, seals, and gaskets but no gears or other hard parts. The UOA showed that the oil had sheared down quite a bit.

This time I used Red Line MTL and at 440,000 miles there's no noise, shifts great and this new oil has not sheered down. It costs a bit more but since I only change it every 60K it's worth it to me. The Mobil 1 I'd previously use was changed every 30K and still had the shearing problem.

Re: 89 Dakota Manual trans fluid change. [Re: kafka45] #4484226
08/10/17 12:12 AM
08/10/17 12:12 AM
Joined: Sep 2015
Posts: 2,262
Malaysia
zeng Online content
zeng  Online Content
Joined: Sep 2015
Posts: 2,262
Malaysia
1980's ..... pick any 80W90 GL4.

Re: 89 Dakota Manual trans fluid change. [Re: kafka45] #4484253
08/10/17 03:36 AM
08/10/17 03:36 AM
Joined: Jun 2013
Posts: 1,711
Virginia
mattwithcats Offline
mattwithcats  Offline
Joined: Jun 2013
Posts: 1,711
Virginia
I had a 1988 Dakota...

Full synthetic caused leaks,

10W-30 full Dino was really hard to shift in the cold...

I used Shell Rotella T5 semi synthetic in 10W-30...


2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Purolator Synthetic PSL 14610, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)
Re: 89 Dakota Manual trans fluid change. [Re: kafka45] #4484385
08/10/17 08:04 AM
08/10/17 08:04 AM
Joined: Dec 2008
Posts: 3,082
Occupied Virginia
Bottom_Feeder Offline
Bottom_Feeder  Offline
Joined: Dec 2008
Posts: 3,082
Occupied Virginia
The last time I used a full synthetic (Mobil 1) in a manual transmission that called for regular motor oil (a '94 del Sol) it HATED it. Nothing but grinds and missed shifts. Went back to a name-brand dino oil in short order and it was mostly fine after that but never 100%. One of the many 'one step forward, two steps back' issues I had with that poor car. It deserved better.

Personally, I wouldn't use a full synthetic fluid in a transmission unless it was designed specifically for that purpose.

Re: 89 Dakota Manual trans fluid change. [Re: kafka45] #4484480
08/10/17 09:35 AM
08/10/17 09:35 AM
Joined: Apr 2008
Posts: 12,869
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,869
Onondaga County
I have a transmission that is also recommended 10w-30 per revised service information. 10w-30 is still the way to go in it.

I did end up putting in 15w-40 because it's cheaper and it's a beater.


18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M
Re: 89 Dakota Manual trans fluid change. [Re: kafka45] #4484557
08/10/17 10:38 AM
08/10/17 10:38 AM
Joined: Dec 2006
Posts: 921
midwest
JamesBond Offline
JamesBond  Offline
Joined: Dec 2006
Posts: 921
midwest
I would use Pennzoil synchromesh, it is slightly thinner than 10w30 at operating temperature but is designed for transmissions. I don't think newer motor oils have the same additives that they did when your owners manual was written. I've used synchromesh in several different vehicles that call for thicker or thinner fluid and it has always worked well.

Re: 89 Dakota Manual trans fluid change. [Re: JamesBond] #4484764
08/10/17 01:54 PM
08/10/17 01:54 PM
Joined: Sep 2010
Posts: 7,016
Texas
4WD Online confused
4WD  Online Confused
Joined: Sep 2010
Posts: 7,016
Texas
Redline MTL gets used in synchromesh applications - have it in my transfer case.
Notice the nectar color:

Re: 89 Dakota Manual trans fluid change. [Re: mattwithcats] #4487194
08/13/17 10:23 AM
08/13/17 10:23 AM
Joined: Jun 2002
Posts: 19,246
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,246
Iowegia - USA
Originally Posted By: mattwithcats
I had a 1988 Dakota...

Full synthetic caused leaks,

10W-30 full Dino was really hard to shift in the cold...

I used Shell Rotella T5 semi synthetic in 10W-30...



If you had a degraded and false seal before using synthetic, sure it will leak.


My two picks would be Amsoil MTF (Manual Synchromesh Transmission Fluid, 75W80 GL-4, 5W-30)

and

Redline MTL 75W80 GL-4 Gear Oil.


Last edited by MolaKule; 08/13/17 10:25 AM.

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