BMW uses o-rings at random points in the engine to properly seal in oil, fluids while keeping out water, dirt and other contaminants. Turner Motorsport carries every o-ring you will need to get your engine sealed up properly.
This is the sealing o-ring used for many oil cooler kits on various BMW models. They're also a prime source for oil leaks because the o-ring gets 'flat' or shrinks or becomes damaged. These are usually easy to change though which puts an end to annoying small oil leaks.
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