Vehicle with oil insulation performance detection

A vehicle comprising:

• drive wheels;
• an electric motor serving as a power source for driving the vehicle;
• a power transmission apparatus configured to transmit a power of the electric motor toward the drive wheels;
• an electric-insulation-performance determining portion configured to determine an electric insulation performance of an oil supplied to the electric motor and a lubrication required portion of the power transmission apparatus;
• and
• a notification portion configured to notify a driver of the vehicle about the electric insulation performance of the oil which is determined by the electric-insulation-performance determining portion, wherein
• the vehicle further comprises, in addition to the electric motor, an engine serving as another power source for driving the vehicle, and
• in a driving state of the vehicle in which a power of the engine is distributed to the electric motor and a rotary member that is mechanically connected to the drive wheels, the electric-insulation-performance determining portion is configured to determine that the electric insulation performance of the oil is low when a torque ratio, which is calculated by dividing a sum of an estimated torque of the electric motor and an estimated torque of the rotary member by an estimated torque of the engine, is not lower than a first threshold value that is higher than 1.0.