Service and maintenance 151Recommended fluids,lubricants and partsRecommended fluids andlubricantsOnly use products that meet therecommended specifications.Damage resulting from the use ofproducts not in line with thesespecifications will not be covered bythe 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 oilageing control, whereas viscositygrade gives information on the oil'sthickness over a temperature range.Dexos is the newest engine oil qualitythat provides optimum protection forpetrol and diesel engines. If it isunavailable, engine oils of other listedqualities must be used.Recommendations for petrol enginesare also valid for Compressed NaturalGas (CNG) fuelled engines.Select the appropriate engine oilbased on its quality and viscosity3 154.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 onlyACEA A1/B1 or only A5/B5 quality isprohibited, since it can cause long-term engine damage under certainoperating conditions.Select the appropriate engine oilbased on its quality and viscosity3 154.Additional engine oil additivesThe use of additional engine oiladditives could cause damage andinvalidate the warranty.Engine oil viscosityThe SAE viscosity grade givesinformation on 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 grade3 154.All of the recommended viscositygrades are suitable for high ambienttemperatures.Coolant and antifreezeUse only antifreeze approved for thevehicle. Consult a workshop.The system is factory filled withcoolant designed for excellentcorrosion protection and frostprotection down to approx. -28 °C. Innorthern countries with very low