For the engine control computer program of vehicles with a DPF (Diesel Particulate Filter) system, the fuel injection amount of the DPR(Diesel Particulate active Reduction) system under low load conditions is not set correct, and therefore, surplus fuel may mix into the engine oil. If this occurs and the engine oil level remains above the recommended limit, the engine oil could enter the intake, generating white smoke and causing the engine revs to rise, and in the worst case the engine could stall without the ability to restart.