ive got a 03 plate wrx ppp full service history, i had it serviced at 49,000 and its now on 55,000 i check the oil once a week and it hasnt used anything, Ive been having my exhaust fitted and noticed a small patch on the engine undernearth i wiped my finger and it was engine oil, what could it be is it any thing to worry about?

 

Where abouts on the engine was the oil?

 

Im jacking the car up again saturday, Ill take a picture, it was on the plastic cover benerth the engine

 

the most common ones are rocker cover gaskets.