Crunchy manual gear shift after gearbox oil change
Hi all,
I recently had the gearbox oil changed on my 2018 Scirocco 2.0 TSI (66k miles, UK) as a preventative measure. Before the change, the gearbox was slightly notchy but nothing major.
The mechanic used a generic 75W-90 oil, and straight afterwards the gearbox felt much crunchier when cold. He suggested it could be the gearbox itself, but I wasn't convinced as it was fine beforehand.
I then bought some Red Line MTL 75W-80 after hearing good things about it and had the oil changed again. It's improved slightly, but it's still crunchier than before, especially on cold upshifts from 1st to 2nd and 2nd to 3rd. There's a little crunch going into 4th as well, but not as noticeable.
I'm now wondering if I'm using the wrong oil, or if there's something else going on. It seems strange that the issue only appeared after the oil change. Has anyone experienced something similar? Will it damage the car ?
Thanks in advance!