Dexos 1™ Gen 2 Spec Engine Oil. GM: dexos 1™ Gen 2. 5L Fully Synthetic 5w30. A fuel efficient engine oil Designed for use in GM / Vauxhall Turbo Petrol Engines. The use of this oil will help to combat the Low Speed Pre-Ignition Issues (LSPI) commonly found with the newer Vauxhall Petrol Direct Injections Engines.
