Yesterday I bought a 2005 Suzuki Reno 5 speed with 68k miles for 3 grand. It's super clean and seemed like a really solid little commuter vehicle. It was a little low on oil but still above the min mark on the dipstick. It seems to be going through some oil which bothers me but I've noticed today it rattles and sounds almost like a diesel. The oil level is perfect now so it's not like it's starved. It could be that it sounded the same yesterday when I was checking it out but because I was trying to look at anything and everything, I just didn't notice. Is the GM 2.0 Dtec just a loud little engine or should I worry of bigger problems? Consumer reviews for this car were vastly positive.