Oil light came on I immeditely stopped the car put 5 quarts of oil in it is still and now engine sounds very rough.have had previous problems with blowing during cold weather.?

Driving with a low oil level can cause serious engine damage. Adding oil after the light came on suggests your engine was likely running without sufficient lubrication, potentially leading to significant wear and tear on internal components. The rough engine sound strongly indicates that this damage has already occurred.

The previous problem with "blowing" during cold weather suggests a potential leak in the system, possibly a head gasket issue (though other possibilities exist). This leak could have contributed to the low oil level.

Do NOT drive the car. Further driving could cause catastrophic engine failure.

You need to have the car professionally inspected by a mechanic *immediately*. They will need to diagnose the exact cause of the low oil level (leak, faulty sensor, etc.) and assess the extent of the engine damage. Depending on the severity of the damage, repairs could range from relatively minor (if it's just a leak) to extremely expensive (requiring a rebuild or engine replacement).

Ignoring this problem will almost certainly lead to a much more costly repair in the future, or even a complete engine failure. Get it checked as soon as possible.