Oil Pressure Light
 

I have a 2003 audi a4 1.8t quattro and recently the oil pressure light would blink and then clear out. The first time it came on i immediately checked my oil level and it was good, the next day I immediately got a full synthetic oil changed as well added dura lube sludge away, the mechanic who did my oil change told me the engine was good it doesnt burn nor leak oil. Fast forwarding was driving and the oil pressure light blinked again and then disappears. If anyone could help me out and help diagnose my car would really appreciate it.