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Instead of regular hydraulic fluid, food-grade vegetable oil fills the hydraulic cylinders powering the “O” lifts — so they don’t contaminate the water in case of a leak.

Investigators said Friday they found hydraulic fluid leaking from a hose in the landing gear system of a FedEx plane that was forced to make an emergency landing this month in Chattanooga, Tennessee.

An FAA environmental assessment of the spacecraft notes that some stages of the rocket used kerosene as fuel, which is toxic to breathe; the assessment also notes over 100 gallons of hydraulic fluid in the rocket, which is often hazardous.

Finally, once in 2019 and again in 2021, the agency sent crews there and ran DNA tests on bone fragments found deep underground, which still smelled of hydraulic fluid decades later, said Mark Khan, a researcher of military history.

In the name of public safety, the city greased the poles — initially with Crisco in 2009, then with hydraulic fluid during the Eagles’ 2018 Super Bowl run and again for this year’s National League Championship Series.