long story short last time i changed oil was almost 2 years ago. I normally change my oil every 6k or 6 month, but since i moved last year ive been busy and forgot all about it. I think i have about 9-10k miles in the 2 years. 90% mileage was put on 1st year. 2nd year car was barely driven. As of right now i dont experience any noise or symptoms. Should i worry down the road? did i cause any wear or damage? or have i dodge a bullet since i dont experience any noise or symptom? I use pennzoil full synthetic every time if it makes a difference.