[97cavalier]

wow, since nov, that is a long time, and do not go any heaver than 10w30 you will screw up you rings fast. And the oil pan is at the bottom of the motor where the oil plug is. And the idle can be a air filter also. I would change it also. And if not changes yet the fuel filter needs to be changed to. And i would change the pcv valve to, you change them when you do a tune up. If you have no clue about cars, have some do this stuff for you. And also take your air intake box off and get some carb and choke cleaner and get a lin frr rag and clean your throttle body. All of this will make a world of diffrence!!