Service and maintenance 177Recommended fluids,lubricants and partsRecommended fluids andlubricantsOnly use products that have beentested and approved. Damageresulting from the use of non-approved materials will not becovered by the warranty.9 WarningOperating materials arehazardous and could bepoisonous. Handle with care. Payattention to information given onthe containers.Engine oilEngine oil is identified by its qualityand its viscosity. Quality is moreimportant than viscosity whenselecting which engine oil to use. Theoil quality ensures e.g. enginecleanliness, wear protection and oilaging control, whereas viscositygrade gives information on the oil'sthickness over a temperature range.Dexos is the newest engine oil qualitythat provides optimum protection forgasoline and diesel engines. If it isunavailable, engine oils of other listedqualities have to be used.Recommendations for gasolineengines are also valid forCompressed Natural Gas (CNG),Liquified Petroleum Gas (LPG) andEthanol (E85) fuelled engines.Select the appropriate engine oilbased on its quality and on theminimum ambient temperature3 179.Topping up engine oilEngine oils of different manufacturersand brands can be mixed as long asthey comply with the required engineoil quality and viscosity.Use of engine oil with only ACEA A1or only A5 quality is prohibited, sinceit can cause long-term enginedamage under certain operatingconditions.Select the appropriate engine oilbased on its quality and on theminimum ambient temperature3 179.Additional engine oil additivesThe use of additional engine oiladditives could cause damage andinvalidate the warranty.Engine oil viscosity gradesThe SAE viscosity grade givesinformation of the thickness of the oil.Multigrade oil is indicated by twofigures, e.g. SAE 5W-30. The firstfigure, followed by a W, indicates thelow temperature viscosity and thesecond figure the high temperatureviscosity.Select the appropriate viscosity gradedepending on the minimum ambienttemperature 3 179.All of the recommended viscositygrades are suitable for high ambienttemperatures.