FHN gear oil.

[Denig]

Hi guys quick question. What is the proper gear oil for FHN? I bought Redline 75w-80 GL4 and want to make sure it safe to use before I fill it up. Considering price of gearbox and difficulty of swap I do not want to have issues. Thanks

 

[DeliveryValve]

I asked this same question awhile back. The FHN has hypoid gears and you want a fluid that will protect it. I found Redline will not work.
It was recommended here that Fuchs Titan Sintofluid 75w-80 will fit the bill and is a factory fill. It's a GL5, but will not hurt the brass synchros.

TITAN SINTOFLUID SAE 75W-80 | Automotive lubricants | FUCHS LUBRICANTS CO. (United States)

Description TPremium Performance Manual Transmission Fluid for passenger cars. Offering good gearbox efficiency. Suitable as fill for life fluid according to manufacturer. Advantages/Benefits Rationalization of product diversity to one FE-MTF offers reliable operation under high loads in...

www.fuchs.com

 

[Mongler98]

This should be fine to use if you wanted to use redline. Red Line (50304) MT-90 75W-90 GL-4

 

[DeliveryValve]

This should be fine to use if you wanted to use redline. Red Line (50304) MT-90 75W-90 GL-4

Quote from redline website: "MT-LV, MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears"

MT-90 75W90 GL-4 Gear Oil

Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota

www.redlineoil.com

 

[Mongler98]

HUMMMM. so please explain to me the difference between these 2 statements
While i know what a hypoid gear is, i fail to see why it would not be good for it or to be used? is it the viscosity? I was unaware that there are still Diffs being made that are NOT hypoid! Why would they say that? I know that most trans fluids are a marketing "scam" For instance Porsche trans fluid is IDENTICAL to the toyota 4 stuff. and most fluids have this similarity / commonality.
Why would any fluid that is good for brass syncros be bad for 99.9% of all Diffs on the market? I ran this stuff in my jetta and also in nearly all my diffs on my shaft driven motorcycles and they are all hypoid diffs. never seen an issue.


*Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage
and
*MT-LV, MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears

Its been a while but you are correct that its not for hypoid gears

 

[DeliveryValve]

^^ not sure what you are asking. Bottom line here is the Redline is missing the Extreme Pressure (EP) component that is required for hypoid gears. So you wouldn't want to use it for differentials or any manual transmissions with hypoid gears.

 

[DeliveryValve]

FYI - OE fluid part number: # G 052 911 A2

 

[Denig]

Thanks for the help. It was kinda hard to find but I bought some Fuchs Titan Sintofluid. Good thing I asked or I would have installed the Redline MTL. Now I have peace of mind knowing I have the proper fluid in there.

 

[MEgearhead]

FWIW I decided to go with the VW fluid (G 052 911) after researching this very subject extensively. The issue is that the longitudinal manual boxes have both synchros and a hypoid gear set for the final drive. It's effectively a manual transmission and rear axle in the same assembly. The oil must be safe for both which are somewhat conflicting requirements. In addition, for cold weather shifting a lighter weight oil is better, but for the final drive a heavier weight oil would be better. After much reading on Bobistheoilguy, it seemed that those who used the OE fluid had no complaints, while others had either cold shifting issues or failures depending on what end of the spectrum oil they chose. The one oil analysis I found on the OE fluid placed it squarely in the middle of modern MT fluid and rear axle oil. I could not find any comparable analyses on aftermarket. At $60 total for oil you will never change I figured it didn't make sense to experiment. There are some European oils that are supposed to be equivalent, but they were in the same price range.

 

[Lotawood]

I also need some FHN oil.
Is Pentosin MTF2 going to work?
75w-80 GL-4. Available at Napa. I want Fuchs Sintofluid, but looks hard to get.

 

[Yetii]

I would like to weigh in on this.
This should apply to any manual swapped B5 TDi Passat with these Trans codes FHN/GGB/DUK/EEN/GFL/DHL/DHF

From vigorously searching online and asking people from the forums, I feel I am a bit more knowledgeable on the situation. I also feel like people have missed some things about the Manual swapped B5 Trannys coming from Europe. Finding any information about the european market stuff is kinda hard and confusing to research on google.

After confirming with members here and Frans from DutchAutoParts, who sent my manual trans, the OEM PART # G 052 911 A2. This is the correct oil, needing about 2.3Ls to fill it.

When looking at this fluid it says on ECS or other sites that it is a GL-5 rated oil. Now from owning other VWs I always understood it was GL-4 oil need. Some other owners agreed. After researching the oil is technically rated a GL-4+ (GL-4/GL-5) which from my understanding is practically a GL-5 fluid with lower sulphur levels to make it safe for yellow metals but also have the Extreme Pressure (EP) properties to make it safe for the hypoid gear. (That’s pretty much in layman’s terms. It’s a lot more technical than that and the way I explained it may be a little off, it’s just how I understood it.)

So the VW Spec for the Oil is VW 501.50 (G50). I wouldn’t use any other oil in there unless it’s rated for VW 501.50.

Some great options are that are VW 501.50 (G50) spec

VOLKSWAGEN
https://www.fcpeuro.com/products/vw-transm-oil-genuine-vw-g052911a2

OEM Equivalent (Febi)
https://www.fcpeuro.com/products/mini-manual-trans-fluid-83220403247

Liqui Moly
https://www.fcpeuro.com/products/75w90-gl4-full-synthetic-gear-oil-liqui-moly-20012

Redline (USE MT-90 ONLY. NOT MT-LV or MTL THEY ARE NOT APPROVED FOR VW 501.50 AND ARE ALSO NOT THE CORRECT OIL WEIGHT)
https://www.fcpeuro.com/products/gear-oil-manual-trans-red-line-50304

Fuchs
https://www.europartsplus.com/Audi-...MIrfbNh7OO9QIVQsqUCR2wOQ9YEAQYBCABEgIQyvD_BwE

Could very well be more options these are the top 5 I know of

All NON VW 501.50 Spec Oil that are ALWAYS RECOMMENDED (I wouldn’t use them but other members seem to have no problems long term)

Pennzoil Syncromesh
https://shop.advanceautoparts.com/p...ual-transmission-fluid-1-quart-3501/7070062-P

BG Syncro Shift II
https://store.ngpracing.com/bg-products-syncro-shift-ii.html

Pentosin MTF2 (I read it’s discontinued)
https://www.autobarn.net/pentosin-manual-trans-fluid.html

Amsoil
https://www.amsoil.com/p/manual-transmission-transaxle-gear-lube-75w-90-mtg/

Some members have been suggesting mixing a 50/50 mix of Redline’s Superlight Shockproof and any of the above transmission fluids I’ve listed above.
https://www.summitracing.com/parts/red-58504

Hope Some of this info helps everyone. To keep it simple Just choose whatever is approved by Volkswagen. I personally put in Liqui Moly (that’s for all fluids where applicable) because I’ve used there brand for a long time in many European cars such as other Volkswagens and BMWs I’ve owned, plus FCPeuro recommends it. No brand is better than the other so don’t make it complicated. I buy all my stuff from FCPeuro due to their lifetime warranty. So I get free fluid changes for life. If some info is wrong or you know of other approved oils or non approved recommend oils to add to the list please comment.

 

[afarfalla]

^^^excellent job

 

[Yetii]

^^^excellent job

Thanks. Finding info on European market stuff can be confusing and challenging to find on google. So when I research I kinda go into the rabbit hole. Figured my research could prove helpful to someone else because I had this exact question at one point too.

 

[afarfalla]

you saved me a lot of trouble since filled my manual swap with MT-90, i was thinking i had to drain and refill with something else

 

[Yetii]

you saved me a lot of trouble since filled my manual swap with MT-90, i was thinking i had to drain and refill with something else

No Problem!
Your best bet with any vehicle’s oil and lubricants is to find the oem part number and then find that oil’s specific spec rating (in our case VW 501.50). Then you can either google the spec and oils of various brands that are approved should pop up or you can go to your favorite oil brand’s website and read their data sheet with the spec list and find one that is approved.

I always say this with anything that says “one time use” (like stretch bolts) or has a specification rating. It has those things for a reason. You may read it’s ok to do this and that on the forums but realistically most people just know what works temporarily or for a few years. (One acceptation being Pennzoil Syncromesh as far as I can read, but even still I personally wouldn’t use it)

Considering the niche of B5 TDi Passat, especially manual swapped, If you’re like me and you are spending the time and money to convert a Passat from auto to manual (and doing bsm delete and many other upgrades) for a daily you’re gunna keep it for a long time. I personally would want it to last as long as possible (as I plan to keep the car until it literally falls apart. Trynna hit 1m miles.) With that being said. Putting the right oil and lubricants can save you the headache of the “what ifs” and you can be sure in the long run that any issues will be minimized and delayed. No brand is better than the other. Buy the cheapest approved oil or the most expensive. Doesn’t matter AS LONG AS IT IS APPROVED. Syncros and clutchs will eventually go, just depends how long they will last based off of how you drive it and how you take care of it.

 

[50harleyrider]

idparts sells the vw brand tranny oil. i stick with it and always have good luck with no noticeable synchro hard shifting

 

[jetta 97]

There is nothing wrong with original oil,I would not pit anything but original VW Transmission Oil.