i always use synthetic, id say just to be safe go synthetic and always change it 1000 miles or so before it says you should, because you never wanna risk messing up a badass car with something as dumb as oil lol i got the halo lights and there friggen awesome, and people dont hate me because i dont blind them at night, plus not many people have halos so its just something different. Im probably going the get a single racing stripe down the middle and a roush stripe on the side of my car soon (you can look at my post from like a day or 2 ago). Grabber blue on black, its gunna be suweeet. I hear tuners are great on autos, but then again im not really a engine guy, my cars hella fast enough for me. The 4.10 gears are pretty awesome, but i'd think it would only be cool on a manual transmission, but im not an engine-junkie so i wouldnt know lol i really only care about making it look better and putting on performance parts if it only makes it more fun to drive (e.g. gears, tuner, exhaust, etc). Anyways, thats my 2 cents. I got loads of fun things to do with these cars, my main probly is lacking of funds :hihi: