2015 Lincoln MKZ Engine: 2.0L L4 Naturally Aspirated;EngineVIN: U; Thermostat Housing To Block; Replaces OE Part Number(s) 6G9Z-8255-BA;. 2014 Lincoln MKZ Engine: 2.0L L4 Naturally Aspirated;EngineVIN: U; Thermostat Housing To Block; Replaces OE Part Number(s) 6G9Z-8255-BA;.