Okay so I just got back from Wal-Mart to get my oil changed. I'd do it myself but the apartments I live in fine people for changing your oil if they catch you. Besides, I don't have a good jack or any tools, really.
Anyhow, I drop my car off at Wal-Mart and go in the store to get some things. It's been about 30 minutes and I figure they should be done by then since there was only one car ahead of me when I dropped it off. So I go back to the tire/lube area and the guys are standing around a computer and moron number 1 says "Hey, okay so...uhh..." and points to the other guy and says "Well, you tell him." At that point, moron number 2 says "Yeah, well, with the turbo you have on your car, we'd have to use synthetic." I simply said "No you don't." Moron 2 says "Well, we highly recommend that you use it." I didn't budge, and said "I don't need it." He continues, "I'm just saying that we really really recommend..." I interrupted him since it was clear he didn't get it: "No it don't need it." So he just gave me this "Alright, whatever you say" kind of response and I left. In retrospect, I should have stayed and watched them do it, but hindsight is always 20/20.
Okay, so basically I pay for it, go out of the garage area where everyone is standing, and they don't make eye contact at all. They just stand around and get real quiet as soon as I walk in. I get into my car which is about 30 yards away, and look over at the garage. They're all standing around, staring at me. It's dark so I don't think they saw me looking at them. I turned on the car and pulled around the corner, stopped, turned it off, popped the hood, and checked to see what I could find. Unfortunately it was dark so I didn't get to see much, but I did notice my coolant resevoir (sp?) was pretty much empty. The resevoir by the turbo, however was full. As I'm looking under the hood, one of the little bastards runs from behind the corner, sees me, and tears off the direction he came. Obviously, he was looking for something. The drive home seemed fine. Turbo spooled as normal, no unusual noise, etc. But when I got out and turned it off, things seemed different. I sat there revving over and over again, listening and knew something was off. So I got my roomie to step on the gas a little bit while I stood in the back. It sounded louder, for sure, but was almost the way aftermarket exhaust sounds. It had that crackling to it, and under any other circumstance would be a welcome sound to me. But I was worried because it had never sounded anything close to that before. Every once in a while, there would be a medium-loud "pop" sound too.
So what I want to know is what could possibly be the cause of this? What could some punk-ass kids have done to make things sound so different? Is it bad that I'm hearing that? I'd appreciate any help I could get. Thanks guys.