Grzegorz Duda will demonstrate how to refresh the leather upholstery on the example of the Mercedes S-Class and how to clear water outflows in a Volkswagen Passat B5. We will show the differences between 0W30 and 10W60 oil at low and high temperatures - we will explain what oils characterize. Finally, we will explain the role of the thermostat in the car and show you how to replace it in the Mazda 626.