Hello,

I'm wondering what people have learned about engine oil, in particular, if it actually goes 'bad' after a certain amount of time sitting in the engine. I need to change my oil in my Barracuda. It is pushing 10 months old at this point. Haven't driven the car much due to lousy weather. There might be ... 2k miles on this oil (Valvoline VR1). I think I have read that engine oil should be changed every 3k miles or 6 months. How did they come up with those numbers? Probably marketing, but maybe the 6 month mark the oil begins to break down? I don't know, and that is why I am asking.

Thank you in advance.