[bigmike]

[quote name='bigmike' post='30279' date='Jan 28 2007, 01:04 PM']Also, I want to change the transmission oil in my Tiptronic transaxle. The specs say to use "Hypoid transmission oil SAE 75W90". Is Hypoid transmission oil a fancy name for "gear lubricant", and can I just use a good synthetic "gear lubricant"?[/quote]





FYI. I did some research on this, and found the answer. The answer is that if you buy "gear lubricant" or "gear oil" and it is rated GL-5, then it is indeed "hypoid transmission oil". The GL-5 rating means that it is designed to be used with the extreme pressure (EP) associated with hypoid gears (the gears cut with a slight curve).



Do not use GL-4 rated gear lubricant in the transaxle, as it is only rated for straight cut gears, and will not survive the extreme pressure produced by hypoid gears.



I bought a quart of Valvoline GL-5 fully synthetic gear lubricant, and will be changing it this week. The specs say it only takes 0.7 liters, and it looks like it will be fairly easy to do. If I notice any difference or run into any strange encounters, I will let you know.

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[968rz]

Thats good info Big Mike, I'll keep that in mind when I change my fluid and filter. For sure let us know how it works with the synth oil.

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[wildcat]

I would like to change the differential oil but have found no illustrations for the location of either the fill or drain plug.  I am assuming this is different than the ATF and filter.

 

TIA...

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[MCL968]

A bit of advice, the plugs can be accessed if you remove the left rear wheel. DON'T take the drain plug out until you have the fill plug loosened. You may have to apply heat around the fill plug to get it to come out, use a heat gun, not a torch, since you are right next to a plastic gas tank. Plan to replace the fill plug and the crush washer as the removal process may ruin the plug. And don't overfill the gearbox. A 1/2" drive allen socket works best because these plugs are often really tight.

 

Amsoil makes a GL-5 that was highly recommended; it's what I am running in my 92.

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[wildcat]

Thank you, I've looked all over for reference to the hypoid oil and at one time even had the Tiptronic transmission out to replace the damper, but obviously missed it.

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[wildcat]

As a post script, the differential is on the right side and being small I didn't realize that is what it was... it appears that it only works on the right side from the PET illustration... curious if anybody knows.

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[Lim Yong]

Interesting. Are we discussing then Automatic transmission oil? Or is there a differential oil that can be changed? If so, where?

Thanks

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[wildcat]

There is a differential associated with the Tiptronic. It is small and can be found behind the right rear wheel as I stated.   A fill plug at the 9 o'clock position and a drain plug at 6. I checked mine and discovered that it had been overfilled, not a good thing.

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[Lim Yong]

Thanks! I'll take a look. Never knew that. Lol

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[Waylander]

Make sure you can undo the fill before undoing the drain, obvious why

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[N_CA]

I am thinking about doing a gear oil change on my manual transaxle, and looked at the fill and drain plugs.  Both of them seem to crush washer seals (I do not want to take them off until I have all the parts/materials to complete the job).  Can anyone answer whether this is indeed the case, and if so, what is the size or part number for the replacement crush washers?

 

Thanks

 

Nathan

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[MCL968]

They are crush washers designed for a single use. I have reused them several times with no bad outcomes, so it's your call. Remove the left rear wheel to get a better shot at the fill plug. And don't remove the drain plug untill you have the fill plug removed.

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