The performance of a grease gun in a high or low temperature environment may indeed be affected to a certain extent, which mainly involves the physical properties of the grease (grease) itself and the working mechanism of the grease gun.

Impact under high temperature environment
In a high temperature environment, the 500cc suction gun grease gun oil fluid suction viscosity of the grease (grease) will decrease and the fluidity will increase, which may cause the following problems:

Over-injection: Due to the increased fluidity of the grease, it may be difficult for the grease gun to accurately control the amount when injecting, which may easily lead to over-injection, which will not only cause waste, but may also have an adverse effect on the lubrication point.
Decreased sealing: At high temperatures, the grease may leak more easily from the lubrication point, affecting the sealing performance, thereby reducing the lubrication effect and service life of the equipment.
Deterioration of grease: When exposed to high temperatures for a long time, the grease may undergo chemical reactions such as oxidation and decomposition, resulting in a decrease in its performance or even deterioration, and it can no longer provide effective lubrication.
Impact under low temperature environment
Under low temperature environment, the viscosity of butter (grease) will increase and the fluidity will deteriorate, which may have the following effects on the use of grease gun:

Injection difficulty: As the butter becomes viscous, the grease gun may require greater pressure when injecting, and may even become blocked, making lubrication difficult.
Increased equipment wear: At low temperatures, if the equipment is not effectively lubricated, the friction between the components will increase, thereby increasing the wear and damage of the equipment.
Solutions
In order to cope with the impact of high or low temperature environments on the performance of grease guns, the following measures can be taken:

Choose butter (grease) suitable for high and low temperature environments.
Preheat or insulate the grease gun to ensure that it can work normally in low temperature environments.
Regularly check and maintain the grease gun to ensure that it is in good working condition.
In summary, the performance of the grease gun in high or low temperature environments will indeed be affected to a certain extent, but by taking appropriate measures, this impact can be minimized to ensure the normal operation and lubrication effect of the equipment.