I have a Opel Astra H GTC 1.6 Twinport 105 hp. The Liqui Moly Oil Top Tec 4600 I can recommend to anyone. In this car I've owned several oil brands: Opel Original, Aral, Liqui Moly, Opel original, now Castrol MAGNETEC (all with Opel release). I'll switch back to Liqui Moly (the true No. 1). The advertising right here really: the world's best oils and care products. The Liqui Moly Oil of Opel runs best of all and jumps best, and he besschleunigt better, consumes up to 1 liter less fuel, according to Computer and speedometer range, and the motor stops with this oil something of immaculate (Castrol is stinking black soup - never again). Even the cold-start and cold-running with Liqui Moly engine oil are outstanding good and quiet (the valves rattle a lot less). Also with me is always the Liqui Moly Oil Additive MoS2 (molybdenum disulfide). This material has the property to adhere to mikroskopischunebenen metal grinding all kinds of surfaces and forms a high strength lubricating film which forms new storage areas and eliminate excess leeway. Clean valve and fuel injection cleaner now and then comes into the tank with pure - tip. Cockpit Pfleger is sensational. I am Liqui Moly fan and will be ordering in the future as much as possible from Amazon and pay only half as much as in the specialized trade. Amazon is great and with the prime membership very quickly.