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#516706 - 07/29/05 09:34 AM Using GL5 when called for GL4.
znamya Offline


Registered: 03/17/05
Posts: 91
Loc: Atlanta,GA
Dear experienced Bitog members, I need your advice. My car's (1992 nissan sentra with GA16DE)manual transmission calls for Gl4 transmission fluid.All I can find is GL5 transmission fluid in good brands like penzoil...The shipping is too expensive for me for the speciality formulations MTL transmission fluid. Does anybody put GL5 fluid instead of GL4 and did anybody observed any problems. My best friend has a Mazda Miata, he bought with 98k on it and now he has 168k on it, he only used GL5 fluid. Do you think it is just a coincidence. Thank you for taking your time

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#516707 - 07/28/05 10:44 PM Re: Using GL5 when called for GL4.
OdinsRage Offline


Registered: 03/15/05
Posts: 51
Loc: Schaumburg
find a dealer in your area that carries redline MTL, its GL-4

Works great in my old trans, go to redlines website and do a dealer locatator. Its about 6-7 dollars a quart where i bought mine.

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#516708 - 07/29/05 12:07 AM Re: Using GL5 when called for GL4.
MolaKule Offline


Registered: 06/05/02
Posts: 14644
Loc: Midwest
Most Sentra's require a 75W85 fluid.

Our MTL-P is a 75W85 with an API rating of GL4/GL5 which provides plenty of wear protection and is optimized for synchromesh operation.

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#516709 - 07/29/05 12:59 AM Re: Using GL5 when called for GL4.
ctechbob Offline


Registered: 06/12/04
Posts: 75
Loc: Athens, GA
I've been using Mobil1 75w-90 GL5 in my 91 Miata since I picked it up 30,000 miles ago (74k on the odo) and have no problems with it at all.

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#516710 - 07/29/05 03:56 AM Re: Using GL5 when called for GL4.
Pablo Offline


Registered: 10/28/02
Posts: 46691
Loc: Duvall WA - Pacific NW USA
In some/most cases it will work.........there are some MT's where a real highly EP loaded GL-5 gear is not the best choice - synchros don't work as well.

Here's what I recommend: MTG

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#516711 - 07/29/05 05:21 AM Re: Using GL5 when called for GL4.
mechtech Offline


Registered: 08/11/04
Posts: 2387
Loc: Chicago area
If that is the route you are going to go, then make sure the bottle is labeled for both - that is, GL4 -GL5. If it says GL5 only, I'd continue shopping.
Not to be insensitive, but skipping a lunch or two to get the best performing trans lube is well worth it.
What is your trans worth? How about shifting?

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#516712 - 07/29/05 06:25 AM Re: Using GL5 when called for GL4.
bruce381 Offline


Registered: 06/23/05
Posts: 3324
Loc: Millbrae, CA
GL-4 vs GL-5 other than vis grade is only the difference in amount of AW/EP additive put into the oil. Most oil companies will use 1 additive package for both Gl-4 and Gl-5 the difference is a GL-4 will take a treat of 2%wt and a GL-5 will be a treat of 7%. same additive just more so normally a GL-5 will work fine unless the higher additive causes brass corrosion then a lower GL-4 will be better.

bruce

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#516713 - 07/29/05 11:49 PM Re: Using GL5 when called for GL4.
MolaKule Offline


Registered: 06/05/02
Posts: 14644
Loc: Midwest
quote:
the difference is a GL-4 will take a treat of 2%wt and a GL-5 will be a treat of 7%. same additive just more so normally a GL-5 will work fine unless the higher additive causes brass corrosion then a lower GL-4 will be better
Most EP additves today (since about 1995) include corrosion inhibitors and metal deactivators so the copper alloy corrosion scare is largely a thing of the past. Modern "dual-rated" GL4/GL5 lubes for MT's are completely safe. I know ours are after 5 years+ of testing in all kinds of manual transmissions.

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#516714 - 07/30/05 03:39 AM Re: Using GL5 when called for GL4.
Drew99GT Offline


Registered: 10/11/02
Posts: 20748
Loc: Colorado Springs
I've used Castrol Hypoy C 75w-90 GL-5 in my Corolla's transaxle and it shifted great. However, I tried a GL-5 synthetic (Pennzoil 75w-90), and I literally could not drive around my block. Stuck in 1st cause it wasn't goin into 2nd without some grinding effort. MTL-R from SF has of course been the best.

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#516715 - 07/30/05 04:44 AM Re: Using GL5 when called for GL4.
bruce381 Offline


Registered: 06/23/05
Posts: 3324
Loc: Millbrae, CA
Quote:
"Most EP additves today (since about 1995) include corrosion inhibitors and metal deactivators so the copper alloy corrosion scare is largely a thing of the past. Modern "dual-rated" GL4/GL5 lubes for MT's are completely safe. I know ours are after 5 years+ of testing in all kinds of manual transmissions."

That is very true but some commodity type packages are low on the copper inhibitor and oxidation stability range. With high heat, water contamination and oxidation some packages can "break down or wear out" the copper inhibitor that is why using a GL-5 where a GL-4 can be used maybe asking for trouble.

This can be seen in any major additive suppliers product offerings in that most have a low buck fighting grade and then more premium produts perhaps like what you use in your lubes in that case there is no problem.

bruce

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#516716 - 07/30/05 05:33 AM Re: Using GL5 when called for GL4.
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
Use either the GL4 or dual spec GL4/GL5 fluids in that ol' Nissan.

Mazda allows GL4 or GL5 and should not be used as a comparison.

Most autoparts stores/bike shops/speedshops usually have at least one gear oil that is GL4 or dual rated in the 85wt or preferably 90wt viscosity.

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#516717 - 07/30/05 06:56 AM Re: Using GL5 when called for GL4.
Drew99GT Offline


Registered: 10/11/02
Posts: 20748
Loc: Colorado Springs
If all else fails and you can't find a GL-4, you can always get Royal Purple dual rated GL4/GL5 at Napa.

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#516718 - 07/30/05 08:47 AM Re: Using GL5 when called for GL4.
Leo Offline


Registered: 04/27/03
Posts: 911
Loc: Australia
Why not just use OEM fluid if its difficult to find?

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#516719 - 07/30/05 11:58 PM Re: Using GL5 when called for GL4.
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
quote:
Originally posted by Leo:
Why not just use OEM fluid if its difficult to find?

Because the dealer markup for a cheap mineral oil isn't justified. Plus, to increase profit margins, some dealers will use non-OEM fluids from their 'bulk oil distributor' instead of the company branded products.

Most "boutique" oils cost the same and perform better!

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#516720 - 07/31/05 12:33 AM Re: Using GL5 when called for GL4.
Bror Jace Offline


Registered: 05/27/02
Posts: 4878
Loc: Saratoga, NY
My guess is the OEM fluid is so outrageously priced that you could go aftermarket for the same price and get a clearly superior fluid.

What weight do you need ... have the manual?

Many older Nissan trannies call for a 75W-90 or 80W-90. You might get away with one of the better off-the-shelf GL5 oils as corrosivity is not the problem it was a decade or more ago ... but then again, you might not.

You're best off with the better, name-brand gear oils as opposed to the Supertech and other off-brand stuff.

I just don't think it's a gamble worth taking for $10-15 or so in savings. [I dont know]

--- Bror Jace

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