Hi guys, recently had Tunehouse change my transmission oil after the dealer had done it, when i got it back from the dealer it had bad diff whine and wasnt the best for changing gears especially when cold.
Tunehouse replaced mine with Castrol VMX 80. which is a 75w/80 GL4 oil.
It is perfect now. No noise and excellent for changing gears. WookieBMX from here also drove my car and commented on how well the gearbox feels compared with his which still has the stock oil in it.
I know this has been a problem for a few after an oil change so i recommend this oil 100%.
Also note that the Gen 2 requires a different oil to the Gen 1.