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Old 03-01-2011, 05:22 PM
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Default Manual transmission fluid

I'm coming up on 100k so I'm thinking about changing out my gear oil. Anyone know if I would need GL4 or GL5? The Bentley lists the weight I need, but not if it should be GL4 or GL5. I know on our Mk1 Jetta, GL5 was a no-no.

Also, any how-to for replacing the fluid? Bentley only lists how to check it, not replace it.
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Old 03-01-2011, 05:50 PM
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HERE That's a full DIY btw.
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Last edited by Tico4Life; 03-30-2011 at 03:13 AM..
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Old 03-01-2011, 09:00 PM
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Thanks for the link.

My mechanic actually said it takes GL4.
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Old 03-05-2011, 04:50 AM
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Your mechanic is correct. GL4 only.
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Old 03-05-2011, 05:08 AM
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Yeah I trust them They have it in stock too, so probably next weekend I'll be doing replacing the gear oil. Shifts great, but I figure at almost 100k it is due. Also putting in some new spark plugs, wires, air filter, cabin filter. Giving my car some much needed TLC.
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Old 03-30-2011, 03:03 AM
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Can anyopne rtell me what size hex key is needed to remove the plug from my 99 TDi 5 speed? Also, my Bentley Manual says 75W 90 oil for refill. What is GL4 or GL5?

Noob
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Old 03-30-2011, 03:20 AM
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should be 17mm

get redline 75w90 gear oil
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Old 03-30-2011, 03:30 AM
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GL4 only. Its the type. Should say if its GL4 or GL5 on the bottle.
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Old 03-31-2011, 12:50 PM
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Quote:
Originally Posted by h_2_o View Post
should be 17mm

get redline 75w90 gear oil
I used a trick I learned on a Hayabusa forum to remove the transmission fill plug. DON'T GO BUY AN EXPENSIVE HEX KEY TO DO THIS. Go get yourself a 10mm bolt about 3cm or 1.5" long. The head of it perfectly fits the tranny fill plug. Then use vice grips or a small pipe wrench to turn it. Voila!

I could not get my hands on Redline last night, so I got two quarts of a purple syrup called Royal Purple at only $20/qt. I drove to work today. What an incredible pain to get fluid into the tranny. I put a tue I had on the tip of the bottle cap, with the other in the hole, held the bottle up and punched holes in the bottom of the bottle. It took 30 mins per bottle for that stuff to flow. I will find a larger tube next time.

I will order Redline and probably drain the fluid when it arrives in case any metal is in there. Apparently it has been dry since a shop out of town replaced my clutch. The whirring sound it made in nuetral when I got it back is gone. I cleaned all the old oil and dirt off the underside of the car to see if I can find a leak now.
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Old 03-31-2011, 03:07 PM
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My mechanic actually had a really neat system for filling the trans. Basically it was just a pump bottle that he put a small bit of clear hose on to. Pour the fluid into the bottle, get the hose in the transmission fill hole and just pump the fluid in. We had it on the lift so it was really easy that way. So simple, but it really saved time and effort.
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Old 04-01-2011, 01:01 AM
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Quote:
Originally Posted by Smileybug View Post
My mechanic actually had a really neat system for filling the trans. Basically it was just a pump bottle that he put a small bit of clear hose on to. Pour the fluid into the bottle, get the hose in the transmission fill hole and just pump the fluid in. We had it on the lift so it was really easy that way. So simple, but it really saved time and effort.
For those that are interested, Walmart sells a pump system that screws onto any quart bottle. It kinda has a pump like whats on a lotion bottle. You cand find them in the boating section. They are actually used to fill the lower unit oil on outboard motors. They are a lifesaver for any awkward fluid fill job.
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Old 04-02-2011, 07:36 AM
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Hi

I apologize for asking the same question. I'm just about to change the gear oil in my fiancee's 1998 2.0 Beetle, it has a 5-speed manual transmission. I had purchased 2 qts. of Mobil 1 synthetic 75W90 gear oil, because that is what was indicated in the Chilton's Manual. GL-4 or GL-5 was not specified. The Mobil 1 gear oil I purchased is GL-5. Is it safe to use this gear oil in her transmission?

I understand that GL-5 is unsuitable for transmissions with brass bearings, but I do not know if hers does or does not have brass bearings. How would I tell?
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Old 04-02-2011, 01:41 PM
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My mechanic told me that GL4 is what to use. I know the older manual trans from VW should only run GL4...not sure if they've changed the newer ones that much. I'd go with GL4. Redline is what I used I think.
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Old 04-02-2011, 02:23 PM
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Ok! Redline it is. Thank you for helping me
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Old 04-04-2011, 12:48 PM
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Quote:
Originally Posted by Smileybug View Post
My mechanic told me that GL4 is what to use. I know the older manual trans from VW should only run GL4...not sure if they've changed the newer ones that much. I'd go with GL4. Redline is what I used I think.
I ordered 3qts of Redline on Ebay Thurs and it arrived Sat. Way fast IMO. It was $12/qt + $12 shipping. Hopefully I won't find a leak and see liquid gold running out onto my driveway.
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Old 04-17-2011, 01:57 PM
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I wanted to post a photo of my hex key trick. Also, I had to refill my leaking tranny again, and this time I used what I learned in college. I put a funnel at the end of about 24in of hose and basically fished a beer-bong through the engine to the fill hole.

Beetle :: hexkeytrick.jpg picture by txsunnysky - Photobucket
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Old 05-22-2011, 08:34 AM
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OEM fluid is the way to go. A few years back I switched to a synthetic GL4 fluid and my second gear grind was twice as bad as it had been.

I flushed it all out and switched to the OEM oil from the dealer and I haven't had a grind since.

Think about it... VW gave fairly lengthy warranties on these cars. Their fluids, service intervals, etc were made to save them (and now you) money in the long run.
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Old 05-22-2011, 01:15 PM
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Now I know what a manual transmission is.....
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Old 06-04-2011, 02:15 PM
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Do not use any fluid that meets GL5 specs for any length of time. GL4 has about 1/2 the additives that GL5 has, and is for transmissions, GL5 is for differentials, and will damage the syncros over time.

Amsoil makes a good 75W90 GL4, as does Redline. A Marine gear oil pump is what I used to change mine. Took 3 US quarts as I recall. I took a bolt and welded a nut on to it to make my own tool for free. Get the fill plug out first before you drain the fluid.
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