Recent Topics
Turning off AC before engine shutoff?
by gregoron
16 minutes 11 seconds ago
Havoline Pro DS Advance Auto
by stchman
25 minutes 56 seconds ago
Best Scenic-Fun-Awesome Roads, Bridges, Tunnels
by ExMachina
Today at 02:48 PM
Champion Labs Ecore or Fram Extra Guard
by BigD1
Today at 02:27 PM
Spark plugs
by possum328
Today at 12:37 PM
Rotella 1gl T5 is $13.99 after mail-in rebate.
by shrooms
Today at 12:07 PM
01 Buick LeSabre, unknown oil, 6150 mi
by TonyDee
Today at 11:48 AM
Cooper Tire Rebate for Labor Day 2015
by Ranger1
Today at 11:43 AM
Calcium Based Detergents in Gas or Gas Treatments?
by Virtus_Probi
Today at 11:27 AM
07 Pontiac G6 GTP Val.Max 5W30 5,110/100k
by forkian
Today at 11:19 AM
K&N filter specs
by CELICA_XX
Today at 11:11 AM
Tire Shopping Again!
by Tdbo
Today at 10:57 AM
Newest Members
phrustrated, ronman, edmondw3, Mrsandman, forkian
55162 Registered Users
Who's Online
96 registered (ag_ghost, 901Memphis, Alfred_B, 01rangerxl, Astro14, AZjeff, 9 invisible), 1766 Guests and 146 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
55162 Members
66 Forums
236564 Topics
3811274 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#2075053 - 11/12/10 04:05 PM Difference between 85W-90 and 75W-90 gear oil?
lairdwd Offline


Registered: 11/27/09
Posts: 266
Loc: Boston
I just did a drain and fill on my 93 beater altima manual transmission. The stuff I pulled out was 75W-90 GL4 from 10 years ago. It was pretty bad.

I replaced it with NAPA sta-lube 85W-90 GL4. That stuff was thick! I'm wondering if it's too thick for the New England winters. My owners manual indicates 75W-90 and 80W-90 are good for +40F to -40F. It lists 85W, but I don't know if that's the same as 85W-90.



Edited by lairdwd (11/12/10 04:05 PM)

Top
#2075057 - 11/12/10 04:09 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: lairdwd]
Drew99GT Offline


Registered: 10/11/02
Posts: 21210
Loc: Colorado Springs
It's likely going to make shifting impossible in cold weather and make a huge dent in fuel economy. I'd get some 75w-90 in there.

Top
#2075071 - 11/12/10 04:17 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: lairdwd]
qdeezie Offline


Registered: 08/10/10
Posts: 1185
Loc: Charlotte, NC
You should get that stuff out of there as soon as possible and go back with 75w-90.

Top
#2075093 - 11/12/10 04:42 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: lairdwd]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
There is no need to change it out. Keep it unless it becomes unbearable.

Shouldn't be too bad. I've used the 85w90 year round. It'll be a tad slow the 1st couple shifts during the couple weeks of the Northeast freeze wave every Jan/Feb. Rest of the year was fine.

A bottle of Lubegard gear oil supplement can make up for the cold stiffness.
_________________________
Those who say it cannot be done, should not interrupt the person doing it.
Your automaker lied!
Is this a spelling/grammar forum or BITOG?

Top
#2075102 - 11/12/10 04:51 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: unDummy]
lairdwd Offline


Registered: 11/27/09
Posts: 266
Loc: Boston
Originally Posted By: unDummy
There is no need to change it out. Keep it unless it becomes unbearable.

Shouldn't be too bad. I've used the 85w90 year round. It'll be a tad slow the 1st couple shifts during the couple weeks of the Northeast freeze wave every Jan/Feb. Rest of the year was fine. A bottle of Lubegard gear oil supplement can make up for the cold stiffness.


Thanks folks. Any chance this will congeal and provide no protection in say the few days a year it goes below 14F? I really don't want to pull it all out unless I'm causing risk to the transmission.

Top
#2075104 - 11/12/10 04:53 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: unDummy]
chubbs1 Offline


Registered: 06/09/10
Posts: 4574
Loc: Merritt Island FL, USA
Originally Posted By: unDummy
There is no need to change it out. Keep it unless it becomes unbearable.

Shouldn't be too bad. I've used the 85w90 year round. It'll be a tad slow the 1st couple shifts during the couple weeks of the Northeast freeze wave every Jan/Feb. Rest of the year was fine.

A bottle of Lubegard gear oil supplement can make up for the cold stiffness.





I'm gonna side with you on this, Before you change everything out just wait and see, you should be fine. I have direct experience with the cold and gear-oil even though I live in FL now. tongue2
_________________________
'12 Charger SXT
QSUD 5w30 OEM filter

'12 Charger SXT
Edge FST EP 5w30 OEM (Mine;)

'11 Hyundai Sonata GLS
QSUD 5w20 OEM Filter


Top
#2075112 - 11/12/10 04:59 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: lairdwd]
tinmanSC Offline


Registered: 09/07/10
Posts: 2163
Loc: Oswego, IL
I did the same thing on my manual Lexus SC300. I put in a oil that was thicker than called for (this is actually a very long story and frustrating, I will not infuriate you with the details) I ended up draining it in the middle of winter in my garage -- VERY COLD! -- and putting in 75W-90. Shifting was a problem on cold mornings, the oil change resolved the issue. I cannot stay that you will have the same problem, but this is my experience.
_________________________
Cost of Hobby=2L
(Where L=Cost of Lubricant)
95 Lexus SC300 5-spd@200K, 2000 GS300@125K both VML Full Syn+Purolator PSL20195(soon to be Wix)

Top
#2075149 - 11/12/10 05:40 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: lairdwd]
aquariuscsm Offline


Registered: 12/30/06
Posts: 11847
Loc: South Texas,USA
That`s the same gear oil chart that`s in my car`s manual. Get some Amsoil MTG.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
Mobil 1 ATF
Redline Water Wetter

Top
#2075651 - 11/13/10 11:15 AM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: aquariuscsm]
lairdwd Offline


Registered: 11/27/09
Posts: 266
Loc: Boston
So far so good. It's definitely a bit stiff, but seems ok when it warms up. Contrary to the gear oil spec chart in the OP, I have read that 85W-90 is good all the way to 0F, and this post indicates sta-lube flows pretty good for an 85 weight oil.

BTW, I do see that NAPA also has a GL-3/GL-4/GL-5 80W-90 for $3.29 a quart. I probably should have used that, but I wanted to stick with GL-4 only.

One thing for sure though is that I will have to alter my downshifting habits. I like to downshift a lot and use the engine as a brake. Can't do that if it's too stiff. Maybe I'll take the advice and get the lubegard gear oil additive.

It was down almost a quart, and now shifts much smoother. Hopefully will add life . Would like to get 25 years of service out of this vehicle before sending it off to the crusher

Top
#2075717 - 11/13/10 12:31 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: lairdwd]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
Your old oil was beat up and sheared to a thinner viscosity.
Also drained when warm?
So of course the new stuff will appear thicker.

The differences are small between 75-80 and 85-90 [everything else the same].

I am not sure that that particular lube is the best for manual trannys.
Wear should be good, but good shifting is not addressed.

Top
#2076178 - 11/13/10 11:28 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: lairdwd]
Loobed Offline


Registered: 07/20/07
Posts: 3742
Loc: Northern California, USA


I didn't know they made 75w gear oil in 1993.

I think the only difference is cold viscosity. They should both be a 90 weight when up to operating temps. Your 1993 gears are probably loosey goosey, and the heavier oil might be unnoticable or even better.
_________________________
Engine: 2001 GM 5.3L LM7
Current Fill: Valvoline Synpower 5w-30 w/Pure-One PL25288 filter

I.M.N Oil Enthusiast

Top
#2078029 - 11/15/10 08:24 PM Re: Difference between 85W-90 and 75W-90 gear oil? [Re: Loobed]
lairdwd Offline


Registered: 11/27/09
Posts: 266
Loc: Boston
So far so good. After it heats up, it's very nice. Man, I did not realize how shot my old oil was. But those Altima's are rock sold man, despite my lack of education on gear oil changeover. No cheap parts in the transmission like the Honda garbage, so I think it's probably ok, despite the abuse.

With the new gear oil in, it's very smooth. Prior to that, I could not get a smooth transisition between shifts no matter how delicate I was with the clutch. It would always give that knocking sound like when you let the clutch out too fast without accelerating enough. That's what motivated me to do the fluid changeover. Glad I did.

Top