Cover suspected area with talcum powder or similar substance to try to determine where leak originates Valve cover? Engine Seal? Timing chain cover? Oil filter? Oil sending unit?
You can find a small vacuum leak in your 2002 Toyota Camry with a diagnostic tester. The diagnostic tester can pinpoint virtually any vacuum leak.
If you mean the brake master cylinder, then squealing might mean that you have a vacuum leak.
There is not enough information to answer this question
The Camry could have a vacuum leak. If there is a vacuum leak, then there can be a whistling sound until the vacuum system is full of air.
Oil can either be burned, or it can leak
Shampoo the engine to clean it. Check for leaks in a day or so depending on how bad the leak is. Replace the component causing the leak. If you still can't find the leak you can put dye in the engine oil and look for the leak with a black light.
Yes it is, you have to get it looked at ASAP.
Contact the dealership. It might cost you a pretty penny though.
You need to replace the oil seal.
You do not have many choices either replace it or if the leak is not sufficient buy one of those leak fix bottles.
That isn't much consumption.. If it buggs you take it to a garage and have them give you an estimate.
You don't. If it needs refrigrant, it has a leak. Take this to a professional. You have neither the tools nor the expertise to repair.