Warning said it was low on oil when it wasn' - 2007 Chevrolet Chevrolet Impala LTZ

Have you checked with a mechanical gauge to see what your pressure is? You might actually have low oil pressure.

Not good. It is low oil PRESSURE, not low oil LEVEL, although low oil can cause low pressure if the pump is scavenging. When was the last time the oil filter was changed?

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That depends on the type of oil warning light being displayed. There are 2 types of warning lights

1. Low oil pressure light which all cars have
2. low oil level light which some cars have.

Low OIL PRESSURE warning means the oil pressure is below minimum and when this happens there will be insufficient lubrication of many engine parts because sufficient oil cannot get to all parts of the engine it is required to lubricate. Until the cause is identified and rectified the warning light will remain. If you run your engine with low oil pressure you will cause expensive damage to internal engine components.

Low OIL LEVEL warning means the oil in the sump has dropped to a dangerously low level (which may be due to an oil leak or abnormal oil consumption by the engine.) This warning means the oil level needs to be topped up and the warning will stay displayed until you top up the oil. Running the engine with low oil will cause expensive engine damage.
Since it is a 2 minute job, Oil levels should be checked fortnightly as a minimum, together with radiator coolant and power steering fluid levels, if you run the car most days each week as most people do.

It is possible for a warning light to remain displayed when the cause has been dealt with because there is a problem with the sender unit. However it needs to be established with alternative checks that the problem has been fixed before investigating if there is a problem with the warning light itself.

Make sure oil level is full, possible faulty oil pressure sender. replace sender and recheck, if warning still comes up, possible internal engine issue.

I am going to assume you have checked the oil level to make sure the engine has enough oil.
If it really is a warning light for low oil it could be that the shop knocked the wire off the sensor.
If it is the warning light for low oil pressure, it could be the sensor or you could really have low oil pressure and still have plenty of oil.

If you have two different warning lights, it could be a wiring problem.
The low oil pressure warning could come on even if the engine is full of oil. If that is the only light coming on, it could be the sending unit or you could actually have low oil pressure.

Replace the oil filter as it is clogged very cheap fix. I hope this helps.

The engine arning light will be a compleatly different fault to the low engine oil.any of these oils will do 5w30 10w30 5w40 10w40

Check your oil, it may be low if not the oil pressure needs checked. The sending switch could be bad or you have low oil pressure. If you have low oil pressure have it fixed ASAP. The loss of oil pressure can cause severe engine damage.