check engine light and oil light oil light only comes on after u have driven it

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i drive down about 20 miles or so then oil light starts blinking and will come on like the car is not getting any oil i hear a clicking noise on right side of engine got the computer thing done the codes r aaCMP timing stuck in advance position says that twice timing belt jumped took it in to the shop he said he checked it and timing was fine but when the has been driven and that oil light comes on that cars engine does race you can hear it so i lost the mechanic says he thinks the car needs a new motor !i don"t know what to do anymore!!!i need some one to help me!