I've been reading this board for about 2 years now, thanks for all the great info. I tried searching but couldn't find an answer to my question, and I don't think it goes in the oil analysis forum. Sorry if it's been asked before, just point me in the right direction I'm about to purchase a used 2003 Subaru WRX from a friend's friend. About 25k miles, oil's been changed to synth since about 6k, been using Mobil 1 (not sure as to exactly which weight, etc). My friend says he does drive the car hard but doesn't abuse it, and it certainly seems in excellent condition. I trust the car and him. My question is, he has about 3k miles or so on the oil in the pan. For various reasons he hasn't driven the car more than once or twice a week, about 10 miles each way, for the last 3 or 4 months (most of his earlier miles were from road trips and a much longer commute). I want to start using Blackstone's oil analysis program. Should I just drain and refill, and send in a sample 3k miles from now? Or is this oil ok to send in right now? I don't know if the relative inactivity would skew any results. Also, is the "Dyson" analysis worth it? Thanks alot for any help!