A routine oil change is one of the simplest, cheapest things you can do to keep a car alive.

But apparently, it’s still something that even a professional can get wrong.

In a recent video, a mechanic (@awmgatlinelad) filmed what came in through the door of the shop he works at. It was a 2021 Toyota Tundra with oil absolutely everywhere.

The mechanic explains that the customer had just gotten an oil change at a quick lube shop but later realized there was oil leaking.

"Do you see anything wrong with that oil filter housing cap? Where's the O-ring? I thought the O-ring was supposed to go on the inside, not the outside,” he asks sarcastically.