I tried to find any info in the car manual but nothing about the gearbox.
This's my car specs how would I know the gearbox code?
VOLKSWAGEN GOLF 90 TSI COMFORTLINE Manual MK7 AU 4 Door Hatchback FWD PETROL 1.4 litre, CXSA I4 16v DOHC I/C Turbo Direct Inj {90kW}
Looking at the data I have its likely your car has an MQ200 designation 6 speed gearbox, with the old type code of a 0AJ...& when matted to your engine has a subcode of PRL or MYF.
As I don't know which gearbox you car has you will have to look at the data stickers in the boot, or the handbook, as the two possible gearboxes require different oils to each other...
The procedure etc is all in that post I previously linked to, but I'll repeat it here:-
Procedure for the MQ200 gearboxes
This is the old VAG gearbox drain. Basically there is one drain plug by the driveshaft to drain & one high up on the same section to fill. Undo the drain plug, drain oil, refit drain plug, drop car down to level ground. Then fill the oil via the upper plug until it comes out of the plug. Basically the oil is level when it reaches the bottom of the fill plug hole & stop pouring out! If the drain/fill plug is a 12point TX star anti-tamper torque to 25Nm, if its a six side hex type, torque to 30Nm.
MQ200 6-speed:-
0AJ design type fitted to:-
Petrol 1.0lt, 81kW 85kW = Codes stamped on gearbox casing:- QGG, REK, SEE
Petrol 1.2lt, 77kW 81kW = Codes stamped on gearbox casing:- MYF, PRL, RGN, RKC, SEH, SEK
Petrol 1.4lt, 81kW 85kW, 90kW, 92kW = Codes stamped on gearbox casing:- MYF, PRL, RGN, SEH, SEK
Petrol 1.5lt, 96kW = Codes stamped on gearbox casing:- RLP, SEL,
Oil type required =
G 052 171 oil = MYF
G 052 527 oil = PRL, REK, RGN
Quantity of oil = 2.3lt
12 point drain/fill plugs 25Nm, six point = 30Nm