1993 Lexus Other

I have a 1993 Lexus ES300 with 165K mile. There are several problems I need answered.
1. There is a small oil leak somewhere behind the engine that has gotten worse over time. What can be the problem?

2. My air conditioning cool switch on my air conditioning system started blinking the other day and the air system shut down. The cool air switch refuses to cut on and it apears that my compressor has seized. Did I damage my whole system or should I just replace the compressor. Also the system is using R12. Should I just charge the new compressor with R134 or have the entire system upgraded?
July 8, 2006.

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