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Discussion Starter #1
My local dealer is worthless. They can't even sell me some 75/85 GL-4 gear oil. They get it in bulk. I can have the car serviced but they don't sell the oil.

So.... where can I buy 75/85 GL-4 for my 06 GLS 5sp transmission? None of the local stores carry it. NAPA, AutoZone, etc.... they all have 75/90 in either GL-5 only or GL-4-5.
 

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Teach
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4,103 Posts
Go to a different dealer. Call around dealer to dealer to see if they carry quart bottles of the dealer gear lube.

http://www.hyundaipartsonline.com/
^^ is a online dealer OEM parts place based out of Redmond WA. Call them to see if they can ship you quart bottles of the dealer fluid.

Get the part number and enter it on the website to see if it shows up.
 

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Carpe Noctum
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Go to Redline's website and find a local source for MT-90. MT-90 is GL-4.
 

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Banned
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^ Always in the warm weather? I'm sticking with the OEM fluids for me.
 

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Banned
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which is not a problem with the oem fluid.
 

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Where's My Boomstick?
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Another interesting read, especially if you read all pages.
http://www.benzworld.org/forums/unimog/1358944-gl4-vs-gl5-gear-oil-plot.html
well, starting another lube discussion. sure your name isnt really Nodule?

A lot of us, myself included, have tried GL5 fluids that claim to be GL4/5 and I dont know of anyone who has had good luck. When I used it, i could not shift from 1st to 2nd or 2nd to 1st without a grind

there's a couple of places on ebay or online that will sell you Redline MT90. Highly recommended if you cant find the OEM stuff locally.
 

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Teach
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^ Always in the warm weather? I'm sticking with the OEM fluids for me.
me too.
nope i had it when i was in PA too...it was a little stiff in the morning but if you let the car warm up...its fine.
It should not be stiff. Should be smooth even in cold weather. This is why HMA issued the TSB regarding the newer gear oil.
well, starting another lube discussion. sure your name isnt really Nodule?

A lot of us, myself included, have tried GL5 fluids that claim to be GL4/5 and I dont know of anyone who has had good luck. When I used it, i could not shift from 1st to 2nd or 2nd to 1st without a grind

there's a couple of places on ebay or online that will sell you Redline MT90. Highly recommended if you cant find the OEM stuff locally.
The MT90 works, but it is not as smooth as the OEM stuff. The OEM stuff is 75w85 GL4 for a reason. It is not too thick to run in colder weather, which the MT90 is not able to do that well.
 

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Where's My Boomstick?
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75/90 vs 75/85 not that big of a difference. been running it for 2 years without issue.
 

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Discussion Starter #17
Found this previous post:
http://www.elantraxd.com/forums/showthread.php?11947-Manual-Trans-Gear-Oil-Nightmare-!

From the research I've done, it has been stated by oil companies to follow the manufacturer's recommendations and that there is a difference between GL-4 and GL-5, and that they are not interchangeable. Engineers and Salespeople are not saying the same thing, which is no surprise.

Here are some products I've found that should work:
http://www.amsoil.com/storefront/mtg.aspx
http://www.redlineoil.com/product.aspx?pid=46&pcid=7
http://www.pennzoil.com/documents/Pennzoil+Synthetic+75S-90+GL-4+GL-5+ALL.pdf
http://pennzoil.com/#/transmission-fluids-and-gear-oil/pennzoil-synthetic-gear-oils

Questionable products:
Mobile 1 claims their product can be used where GL-4 is specified....
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_Synthetic_Gear_Lubricant_LS_75W-90.asp
http://www.royalpurple.com/gear-oil.html
http://www.buylucasoil.com/viewitem.asp?itemid=10048

Amazon's list of oil products:
http://www.amazon.com/s/ref=nb_sb_s...ield-keywords=gear+oil+75w90&sprefix=gear+oil

---------- Post added 02-11-2010 at 03:33 PM ----------

Man did I open a can of worms.....

For those who want a scientific review of gear oil, check this out:
http://www.amsoil.com/lit/g2457.pdf

Any company can claim what they want but one can learn a lot about testing and test results from the document.
 

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Teach
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75/90 vs 75/85 not that big of a difference. been running it for 2 years without issue.
It can make a difference. If a TSB was written regarding the use of 75w85 oil, there is enough concern of a potential problem with using a thicker oil.
Found this previous post:
http://www.elantraxd.com/forums/showthread.php?11947-Manual-Trans-Gear-Oil-Nightmare-!

From the research I've done, it has been stated by oil companies to follow the manufacturer's recommendations and that there is a difference between GL-4 and GL-5, and that they are not interchangeable. Engineers and Salespeople are not saying the same thing, which is no surprise.

Here are some products I've found that should work:
http://www.amsoil.com/storefront/mtg.aspx
http://www.redlineoil.com/product.aspx?pid=46&pcid=7
http://www.pennzoil.com/documents/Pennzoil+Synthetic+75S-90+GL-4+GL-5+ALL.pdf
http://pennzoil.com/#/transmission-fluids-and-gear-oil/pennzoil-synthetic-gear-oils

Questionable products:
Mobile 1 claims their product can be used where GL-4 is specified....
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_Synthetic_Gear_Lubricant_LS_75W-90.asp
http://www.royalpurple.com/gear-oil.html
http://www.buylucasoil.com/viewitem.asp?itemid=10048

Amazon's list of oil products:
http://www.amazon.com/s/ref=nb_sb_s...ield-keywords=gear+oil+75w90&sprefix=gear+oil

---------- Post added 02-11-2010 at 03:33 PM ----------

Man did I open a can of worms.....

For those who want a scientific review of gear oil, check this out:
http://www.amsoil.com/lit/g2457.pdf

Any company can claim what they want but one can learn a lot about testing and test results from the document.
No you did not open up a can of worms. A lot of people don't reserch what the manufacturer says; they go by aftermarket branded data instead. A manufacturer specifies a specific fluid for a reason.
 

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Where's My Boomstick?
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just saying. a lot of people here have used MT90 without any side effects and many even swear by it.

where i live it doesnt get terribly cold, so that could be why i dont experience any problems.
 

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just saying. a lot of people here have used MT90 without any side effects and many even swear by it.

where i live it doesnt get terribly cold, so that could be why i dont experience any problems.
And for me I see the extremes. The car will be outside in -10 and see the summer heat hit 95-100. I, like most of my midwestern brethren, need the wider range covered. MT90 doesn't cut it. Neither did the pennzoil. I wouldn't trust Amsoil any farther than I could throw a case of their miracle oil with my bad shoulder.
 
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