ÖL-Question: Lower consumption with mobile 10W40?

Hello together! I have a question about the popular oil topic today. At my ABK I currently have a consumption of about 0.6l to 1000 KM. In the meantime I had an oil change with filter made, with it quite ordinary 10W40 from Mobil came in. (Not the famous mobile 1 0W40 ) The car had no measurable consumption (>1000KM) until my girlfriend blew it over the highway and then I filled it again with Liqui-Moly. Now the consumption is My question: Has anyone ever had similar experiences? Where do you buy your oil? I don’t want to buy it on the Internet and certainly not at the car butcher’s shop. So I’m looking for a store in the Frankfurt area. Thank you! r-win