Doing a double take when I found this, i remembered stopping at a dealership in LasVegas in 1981 to buy some oil.
"Where can we change this", we asked.
Out in the desert, they said. So we did, though it didn't sit comfortable with me even then.
Working with old leaky tractors over the decades, I learned that a gas leak would kill grass for months, diesel was particularly evil, taking multiple years to restore the ground. But motor oil and hypoid didn't seem to cause a problem, the grass just kept growing.
Still, having a few hundred million people dumping a couple of gallons all over the place every year just boggles the mind.