Possible causes of low oil pressure include:
* Low oil level: The most common cause. Check your dipstick immediately. If it's low, you need to add oil (the correct type and amount specified in your owner's manual) and investigate why the oil level is low (leak, excessive consumption).
* Oil pump failure: The oil pump is responsible for circulating the oil. A malfunctioning pump can't maintain sufficient pressure. This is a major mechanical problem requiring professional repair.
* Worn or damaged bearings: Worn engine bearings create clearances allowing oil to leak past, reducing pressure. This is a serious internal engine problem.
* Clogged oil filter: A blocked filter restricts oil flow. Replace the filter immediately.
* Leaking oil seals or gaskets: Leaks in the engine reduce the overall amount of oil, leading to lower pressure.
* Oil too thin: Using oil with a viscosity too low for the temperature can lead to inadequate pressure.
* Incorrect oil type: Using the wrong type of oil can affect pressure and engine performance.
* Blocked oil passages: Internal engine passages can become clogged with sludge or debris, reducing oil flow.
If your (or someone's) BMW 730i is showing a low oil pressure warning, DO NOT DRIVE IT. Continued operation could cause irreversible engine damage. Have it towed to a qualified mechanic for immediate diagnosis and repair.
