The AERA Technical Committee offers the following information on an engine oil leak on 2010-2013 GM 2.4L Ecotech engines. This bulletin concerns vehicles that are operated in the coldest temperature regions, where temperatures are commonly below freezing.
The vehicles concerned are equipped with the common GM Ecotec engines LAF, LEA or LUK. Many reports of oil leakage and oil consumption have been reported. The cause of this leakage may be the result of ice forming from collected moisture in the positive crankcase ventilation system (PCV). This blockage allows crankcase pressure to build, eventually forcing oil past the rear main crankshaft seal. In some instances, the seal has become completely dislodged.