159Service and MaintenanceVauxhall genuine parts andaccessoriesWe recommend that you use "Vauxhallgenuine parts and accessories" andconversion parts released expressly foryour vehicle type. These parts haveundergone special tests to establish theirreliability, safety and specific suitability forVauxhall vehicles. Despite continuousmarket monitoring, we cannot assess orguarantee these attributes for otherproducts, even if they have been grantedapproval by the relevant authorities or insome other form."Vauxhall genuine parts and accessories"and conversion parts approved byVauxhall can be obtained from yourVauxhall Authorised Repairer, who canprovide expert advice on permittedtechnical changes and ensure correctinstallation.Performing workTo avoid injury from moving parts andcables conducting ignition voltage, onlycarry out engine compartment checks (e.g.checking brake fluid or engine oil level)when the ignition is switched off. To aid identification, the caps used whentopping up engine oil, coolant and washerfluid as well as the oil dipstick are colouredyellow.9 WarningOnly perform engine compartmentchecks when the ignition is off.The cooling fan may start operatingeven if the ignition is off.9 WarningThe ignition system 3 and Xenonheadlamps 3 use extremely highvoltage. Do not touch.