Agree with Pepster, don't use this oil in your car. I thought it was strange that Honda was selling an auto gearbox oil for outboards (they have a different gearbox design than a car), but this isn't actually for outboard gearboxs. Its for the tilt and trim system, a hydraulic system that adjusts the trim angle of the engine. As pepster said, marine gearbox oils usually have different additivies anyway, for example they have one that changes the colour of the oil should any moisture be present in the gearbox.