How to test the antioxidant property of CK-4 Heavy Duty Engine Oil

Principle: Place the oil sample in a sealed container, introduce oxygen and heat to a specified temperature, and evaluate the oxidation resistance by measuring the time it takes for the pressure to drop due to oxidation of the sample.
Operation: The longer the time it takes for the pressure in the oxygen bomb to drop from the initial value to the specified pressure, the stronger the oxidation resistance of the oil.

Principle: Measure the changes in thermal effects during the oxidation of the oil sample at a constant pressure and heating rate.
Operation: Record the temperature at which the sample starts to oxidize and the heat released by the oxidation reaction. The higher the starting temperature and the lower the heat released, the better the oxidation resistance.

Principle: Simulate the high-temperature working conditions of the engine, circulate the oil through a heated metal tube at high temperature, and detect the mass of the deposits in the tube.
Operation: The smaller the weight of the deposit, the stronger the ability of the oil to resist oxidation and coking at high temperatures.

Principle: Heat the oil sample to a high temperature on a metal plate and observe the amount of coke deposits formed on the metal plate.
Operation: Evaluate the high-temperature oxidation resistance and anti-coking ability of the oil by quantifying the thickness or weight of the deposits.

Principle: Oil oxidation will cause an increase in viscosity. The oxidation resistance is evaluated by measuring the change in kinematic viscosity before and after oxidation.
Operation: The smaller the viscosity increase, the better the antioxidant stability of the oil.

Principle: Oxidation will generate acidic substances. The acid value change before and after oxidation of the oil is determined by titration.
Operation: The smaller the increase in acid value, the more significant the effect of the antioxidant in inhibiting the oxidation reaction.