I am not 100% sure if it is my imagination or it is true.
Every time after change oil, I had about 2K to 2.5K of enjoyment and then I started feeling the engine is louder and not as silky. I heard that Mobile 1 synthetic can last easily 5K for oil change interval but I don't feel smooth throughout the 5K at all. Am I mistakenly lengthen the oil change or...?
If it never last 3K of good time, I might as well use dino oil and change it every 3K. I have been changing oil every 5K in last 25K, should I change the interval? What is your observation and suggestion?