DRIVING AND OPERATING 235If the LKA system is not functioningproperly when lane markings areclearly visible, cleaning the windshieldmay help.A camera blocked message maydisplay if the camera is blocked.Cleaning the outside of the windshieldbehind the rearview mirror maycorrect the issue. Some driverassistance systems may have reducedperformance or not work at all. AnLKA or LDW unavailable message maydisplay if the systems are temporarilyunavailable. This message could bedue to a blocked camera. The LKAsystem does not need service. Cleanthe outside of the windshield behindthe rearview mirror.LKA assistance and/or LDW alertsmay occur due to tar marks, shadows,cracks in the road, temporary orconstruction lane markings, or otherroad imperfections. This is normalsystem operation; the vehicle does notneed service. Turn LKA off if theseconditions continue.FuelTop Tier FuelGM recommends the use of TOP TIERDetergent Gasoline to keep the engineclean, reduce engine deposits, andmaintain optimal vehicle performance.Look for the TOP TIER Logo or seewww.toptiergas.com for a list of TOPTIER Detergent Gasoline marketersand applicable countries.Recommended Fuel (LTG2.0L L4 Turbo Engine)Use the recommended fuel for propervehicle maintenance.Use unleaded petrol with a postedoctane rating of 95 RON or higher andwith ethanol up to 10% by volume.Unleaded petrol rated at 91 RON canbe used, but acceleration and fueleconomy will be reduced, and anaudible knocking noise may be heard.If this occurs, use petrol rated at 95RON as soon as possible, otherwisethe engine could be damaged. If heavyknocking is heard when usingunleaded petrol rated at 95 RON, theengine needs service.Recommended Fuel (LGX3.6L V6 Engine)Use the recommended fuel for propervehicle maintenance.Use unleaded petrol with a postedoctane rating of 91 RON or higher andwith ethanol up to 10% by volume.Otherwise an audible knocking noisemay be heard. If heavy knocking is
