Transmission oil change

The oil in the 02Q 6-x speed manual that inside my Leon has been changed.
I decided to use Valvoline SYN POWER 75W-90 oil that meet API GL-5 standard.

Valvoline SYN POWER 75W-90 bottle

This oil also sutable for the limited slip differentials as mention on the package.
Advanced Xenum VX GEAR oil additive for the manual transmissions has been added too.

Xenum VX GEAR transmission oil additive

The instruction from Xenum said, that this additive should be used only for manual transmissions and not suitable for the automatic transmissions due to the fact that it decreases the friction between the surfaces - and this is not always desirable effect for this transmission type.

Shall you read instructions before using any oil or additive.

Odometer: 65,000 km.