Hi, I saw this website at 3si.org and ptcruiserlinks.com so I thought I'd see what people over here have to say. On my Dodge Stealth SOHC 3.0 V6 I have switched from 10w 30 to 20w 50 half synth oil from Castrol I think. The manually says you can use it and since it never gets cold here I figured it would be better than normal conventional oil. My mom just bought a new PT Cruiser GT, 2.4 turbocharged 4 cyclinder engine. Everyone seems to be changing the stock oil at around 1000-1500 miles to full synthetic. Out of these 2 cars which do you guys think would be the best? My car has some serious blackness on the dipstick(STEALTH) and it was because I was losing some serious oil from the valve seals and I was running the car with very little oil in it for a little while. It ran fine, but obviously I don't recommend running a car with such little oil. I saw none at all on the dipstick. I just ordered some AutoRX from everyone's recommendations and I'm hoping that the engine can clean itself up a bit. Even after an oil change the oil doesn't look nearly as clean as the PT's brand new engine, which almost looks like water, it's so clear. Obviously it's got some sludge and deposits, so Auto RX should really help me out there. I was thinking Amsoil for me, since I don't have to worry about warranties, but Mobil 1 SS is looking pretty good. Tell me what you think.