High quality transmission stop leak?

[karl87]

My manual transmission is leaking or weeping may be a better term from where the bellowing portion mates to the differential portion the seam there. It occurred after I replaced my transmission fluid with redline mt90, now I'm going to change to motul 300 gear. But is like to add something to help the leak, is there a European stop leak for manual transmissions? Or a full synthetic stop leak? Kind of like Lucas heavy duty oil stabalizer but id like something full synthetic preferably European to mix with the full synth ester based motul. Insight?

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[NewToVW]

Don't put anything in there except the proper weight gear oil.

 

[karl87]

Why is that? You think I should separate my transmission and replace the gaskets as opposed to experimenting with an additive? I don't want to mess anything up so please help me out

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[stringshifter6]

You'd be better off replacing the gasket than putting some unknown fluid into your gearbox. Verify that it is leaking and not just spilled fluid from when you replaced it.

 

[karl87]

I did, I've sprayed it dry with crc brake parts cleaner a few times. And its formed a drop by the end of the next day. I know Lucas works, I've used it on my dodge to solve q similar problem, but I don't know if it will mix with an ester based pure synthetic, which is why I'm hoping someone has experience with such a product. Gears, syncros, forks etc. Are all gears, syncros, and forks nothing magic about our transmissions I just want the fluids to mix well and handle the hard and hot driving that I subject my GTI to almost daily in the mountains.

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[stringshifter6]

Switch fluids and see if the seals like it better. I really would not put anything else into the gearbox. They are just bandaid fixes. Fix the problem not the symptom.

 

[karl87]

I agree with that, but I don't think the seals are bad persay I think its the redline oil. I'm hoping the motul works better.

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[Rich241]

I just changed to motul fluid a few weeks ago, no leaks present.

 

[karl87]

Awesome, factory fill before that?

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[Chris@RT]

Changing fluids isn't going to cause or prevent leaks, this isn't a dried out cork valve cover gasket on a 50 year old car it is RTV type rubber sealent that is not broken down by transmission fluids.

If you truely believe it is a leak from the inside attempt to stop it on the outside with some expoxy or similar I Would not add any sort of stop leak to the transmission.

 

[The Fed]

All stop leak does is make the seals swell. I doubt it would work on silicone. Are any of the screws loose? Are you using lighter than stock oil?

 

[karl87]

The fluid is the same weight as recomended by vw, 75w90. The screws holding the two sides of the case together where very loose, but I could only access the bottom bolts to tighten them and the leak is coming down from higher up. I suppose Ill try to smear some rtv around the edge after drying it a bit with some brakleen.

 

[shaunraney]

Why not fix the problem instead of half assing it and chance damaging your car?

 

[Chris@RT]

The screws holding the two sides of the case together where very loose,

You need to figure out why.

If those bolts are loose enough to cause a leak then you are going to have issues down the road.

I have opened up a lot of VW transmissions and never seen those bolts just loose.

 

[karl87]

They wont honor my Warranty due to having an after-market transmission and pendulum mount so I'm on my own. Ill gladly listen to suggestions, The loose bolts are the T45 torx bolts.