I was consistently burning 1 liter of oil every 1200 km (5w-30 oil, the car has 252,000 km). I added this product not during an oil change, but to the existing oil (5 liters of oil with 4500 km on them). The product is a gray thick liquid, but it completely dissolves with the oil. I added the product before a 1200 km round trip. Currently, I have driven 1700 km and today when I checked the oil, there was no drop missing. So obviously, it did the job. I will come back with results after more kilometers.

UPDATE after 2600 km, I added about 700 ml of oil. So, the consumption after using the product dropped to 700 ml every 2600 km