Question about gearboxes

What do I have to say about the engine, and since I didn’t really trust the workshops, I wanted to hear your opinion about it. Otherwise the mechanic talks to me again the Vesper in the backpack because I have no idea. I try to be brief…. So, about 6 months ago I had an oil change and suddenly had an oil stain in the garage. However, what I did not have in the whole 8 years in which I have the V40 yet. So again in the workshop…. but they didn’t have a lot of time and thought the oil would come from above. I then reclaimed so n n liter of oil from Liqui Moly (thought also vll because of the new oil that it is still thinner and the seals with the years also slacken) and then was quiet. Now I had to find out that already had oil in the garage again last week. So n liter of oil vlled and again so oil stop inside. But still drips still…. And now my real question: When switching since a few months did not tell me about the gear change.