2000 e46 323i clicking sound?

I noticed that my car had low motor oil so i bought 2qtz of 10w30 mobil at a autoparts store. I drove it to school. When i got off school approx 4hrs later my car started doing a clicking sound. It seems its coming out of the engine. When I rev the engine, the clicking sound gets louder. What do you guys might be... show more I noticed that my car had low motor oil so i bought 2qtz of 10w30 mobil at a autoparts store. I drove it to school. When i got off school approx 4hrs later my car started doing a clicking sound. It seems its coming out of the engine. When I rev the engine, the clicking sound gets louder. What do you guys might be the problem. Is it bad if I keep driving my car. Thnx in advance
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