1. The mineral oil used contains polar anti-wear additives, and the polar anti-wear additives are mainly phosphorus/sulfur/chlorine. At high temperature, the air contains a large amount of oxygen, and the polar anti-wear additives are oxidized to produce foul-smelling gases. Polar anti-wear additives are generally not recommended to be used at high temperatures, just like ordinary gear oils used on high-temperature chains, the workshop is full of foul-smelling gases.
2. Substances brought into the air, especially those containing phosphorus/sulfur/chlorine. Check if there is any chemical gas or chemical dust around.
3. The rubber hose may be neoprene. The high-temperature lubricating oil dissolves it, and the chlorine is oxidized at high temperature, producing foul-smelling gas. The possible reason is that the synthetic compressor oil of diester is used. Diesters are easy to decompose, and at the same time, they are relatively corrosive. General rubber, especially at high temperatures, is easy to swell (that is, partially swell). Neoprene is generally not recommended for use in high temperature and pressure environments, and rubber hoses are not used correctly.
4. The alternative oil product, in order to make it green, has added pigments that are not resistant to high temperature. Most of the pigments contain elements such as phosphorus/sulfur/chlorine, and the pigments have oxygen and high temperature to produce malodorous gases. Testing oil products is like testing blood, which directly reflects the problem.

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