Trans­mis­sion oil change

Car Mechanics (UK) - - Help! -

I own a 2015 Audi Q3 2.0 TDI with the en­gine code CUVC1 and an 8U chas­sis, which has four-wheel drive. My mileage is around 20,000 miles.

I have been read­ing about the oil change in­ter­vals on the rear Haldex gear­box. It seems that the oil should be changed at 20,000-mile in­ter­vals and the fil­ter ev­ery 40,000 miles. Ac­cord­ing to what I have read, a spe­cial socket tool and arm are re­quired to re­move the fil­ter.

Hav­ing had the car up on a ramp to look at the set-up of the Haldex sys­tem, I have looked around the hous­ing and there does not seem to be a fil­ter. I have been told that, after a cer­tain year, Audi did away with the fil­ter – if this is true, surely it’s not a good idea? I have heard hor­ror sto­ries about peo­ple not chang­ing the oil and fil­ter, which has led to the unit be­ing goosed.

Can you con­firm if Audi has done away with the fil­ter as­sem­bly and tell me how to find the fill and drain plugs for the Haldex sys­tem, as there are a few around the hous­ing as­sem­bly? Also, what kind of oil should I use and what’s the quan­tity re­quired? I take it that the front gear­box uses a long-life oil and this is not nec­es­sary to change un­til a high mileage has been com­pleted – ditto the dif­fer­en­tial gear­box at the rear?

John Hynd

The fifth-gen­er­a­tion Haldex sys­tem in your Q3 is quite dif­fer­ent to ear­lier ver­sions and does not have an ac­cu­mu­la­tor, so­le­noid valve or fil­ter. Its com­plex­ity is quite re­duced from the ear­lier sys­tems and it has its own in­te­grated ECU.

The ser­vice rec­om­men­da­tion for the Haldex cou­pling on your Audi is for the oil to be changed ev­ery 36 months, re­gard­less of mileage. The oil quan­tity is 0.85 litres and the Audi part num­ber is G 060 175; this re­tails at £48 per litre.

The filler for the Haldex cou­pling is near the top at the very back of the unit. You will need an Allen key to undo it and, when retight­en­ing, it should be torqued up to 15Nm. The drain is at the rear lower near­side cor­ner. This also re­quires an Allen key to re­move it and, when re­fit­ted, it should be tight­ened to 30Nm.

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