Why is searching for leaks in high-pressure hydraulic hoses (Hydraulikleitungen) with bare hands extremely hazardous?

1. Fluid at 180 to 250 bar can pierce the skin like a needle and inject oil deep into the tissue, causing an injury that needs emergency surgery
2. The oil is hot enough to cause serious burns on contact
3. The escaping fluid cools rapidly and can cause frostbite to the fingers
4. The main risk is soiled clothing, so gloves are sufficient protection