well a couple things could be wrong depending on what year. if it is a hydraulic lifter then the oil pressure might not be high enough for the oil to reach the lifter causing a knock. another problem could be that your rod and main bearings could be worn out causing a knock and low oil pressure.
YES
If you are losing coolant, you probably have a bad cylinder head gasket. Too much coolant system pressure will drop your engine oil pressure.
Yes, it can. It measures the engine oil pressure and if it fails, the pressure can come through it losing oil.
Im losing engine power in my 2003 CTS?
People losing fingers by not shutting off the disposal when trying to make repairs
Losing a small quantity over a considerable time is not unusual,but if you are using alot like over a week say,then something definitely wrong.Check for small leaks around all hoses and if engine heats up too quickly or if there are signs of over-heating.
Tighten it up!
Your house may be losing water pressure due to a clog in the pipes, a leak, or a problem with the water supply system. It is important to investigate the issue to determine the cause and address it promptly to restore water pressure.
When a Hyundai is losing compression in its engine the car will not run properly. Symptoms of low compression are misfires, stalls, and overheating.
There are several possible reasons for losing water pressure in your shower. It could be due to a clogged showerhead, a leak in the pipes, a problem with the water supply, or a malfunctioning pressure regulator. It is recommended to check these potential issues to determine the cause of the low water pressure.
A leak, a poor connection or it is burning it.
What happens first? Pressure/Engine Dying? Has the oil always been changed? If not oil will form sludge, when the oil is finally changed, the detergent in the new oil breaks free the sludge which can get sucked into the oil pump intake. this would cause an immediate loss of oil pressure and engine issues. Thats been my experience with sudden oil pressure loss issues. Dan