Gearbox oil chance and bevel box oil grade? G052518A2

[lateski]

Hello!

I'm about to do an oil change on my MY14 T5.1 4motion 0A5 6-speed manual gearbox and bevel gear. I've seen the gearbox uses TL 521 71 quality 75W oil, but haven't found out the specs for the bevel box oil. Do you have any knowledge of it?

I've read through a series of SSP's, workshop manuals and searched ETKA, but haven't come across this G 052 518 A2 oil specifications. Should I just by this from the dealer?

If you have experience/recommedations of different oil behaviors in drivetrain, let me know(Febi, LiquiMoly, Motul, Castrol, Fuchs etc.).

 

[lateski]

I did some digging while planning the service. Crafter bevel box uses the same oil as the T6 and T5.1, and from there I went to MAN epc and searched for TGE bevel box oil which is 09.11070-1010.

From MAN epc I found out the oil is SAE 75W-85, but still no idea about grade(GL-4(+)/5 or what). Oil is about half the price when searching with MAN part number vs VW part number.

 

[lateski]

I'll continue to talk with myself a little more if you'll bear with me.

Most of the oil manufacturers catalogues don't offer any transfer case oil, but Shell does. Shell oil finder has a slight conflict in the info, if I should believe ETKA. The next list about Shell recommendations for the transfer case / bevel box:

T5.1 and T6: 75W-90 GL-5
Crafter: no recommendations at all
MAN TGE: 75W GL-4

I have confused myself a lot trying to figure out what to do with the service, but now I think I have a conclusion for the matter.

For the transmission I ordered online Liqui Moly MTF 5300, 65 € for 3 litres. Bevel box Red Line Lightweight 75W-85(it has GL-5 grade) 29,90 € for 0,946 l from the local store, this is roughly 1/3 of the OEM oil price from finnish dealer.

I'll come back to the topic with pros and cons, if I come across something after or during the service and maybe I'll remember to make an update when the oils have been tested long enough.

 

[lateski]

I started with the bevel box oil, since I got that oil earlier. Quite a simple job, easy access, but 21 mm socket with thin wall is an advantage, because of the bevel box housing is really close to the drain plug.

The drain plug magnet had a little bit of metal shavings in it, but not terrible and oil didn't look as bad as I would've expected. Sure it had changed the color a little darker considering the van has nearly 270 000 km.



I'll continue with the transmission oil once I get it.

 

[lateski]

Just finished changing the transmission oil and it was varnished. The both front drivetrain oils were propably changed for the first time, but the transmission oil was a lot darker.


I initially started this service because I have worn bearing kind of noise when driving over 65 km/h. Oil services didn't help. The rear diff oils and propshaft supports/bearings have been changed 1,5 years ago, while I refurbished haldex unit. Wheel bearings have been tested to be still good.

Guess I'll try driving without propshaft next, because those changed bearings were kind of cheap aftermarket ones(VW doesn't offer both bearings for the T5.1 3-piece propshaft). If that doesn't remove the sound, transmission bearings would be my next guess.