These little rubber rings seem simple, but they create a seal. Specifically, they sit in a groove and create a watertight barrier between parts – in this case, between the oil sump and whatever it connects to, usually the engine block. They prevent fluids – oil, in this situation – from leaking out. They're essentially a flexible gasket. Think of the oil sump as the oil reservoir for your engine. It’s at the very bottom. The O – ring sits right where the sump attaches to the engine. It’s a critical part of keeping the oil inside the engine where it needs to be for lubrication. Without a good seal there, you'll have oil leaking out. Well, oil leaks are obviously bad news. Losing oil means less lubrication for your engine, which can lead to serious wear and tear, even engine failure. An O – ring is a small, inexpensive part, but it acts like a shield, preventing a really costly problem. You’ll notice if one goes bad because you'll see oil dripping, and likely smell it too. They can get brittle with age and heat, or get damaged during an oil change if things aren’t carefully aligned. We carry a lot of these at Fixparts Online, and getting the right size is key. There are different sizes for different engines, so make sure you’ve got the correct one before you start. Stand out from the crowd: O-Ring (MPN 13627811934) comes with a 12-month warranty!

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