The thickness has been in my possession for about 1 1/2 weeks now. It's about 1500 km, and it's found out the usual suspects. From small gear loss to "wave acceleration" to the defective hi.li window lifter. all available

Now I was in a garage today and then I said, if he already makes tooth and V-belts, he should change the gearoel also immediately. Can't hurt. Now it is that he meant that today's Getr.oele were aggressier than the old ones and therefore it CAN cause the oil to decompose the clutch linings. He would have had one case or another. It would be a standard automatonoel from VW. How do you grease your gears? What kind of oil has no "dissolving" effect?
Thank you for your tips
Greetings from Switzerland