what kind of oil can i use

Most commonly 10w-30 motor oil would be used. The owners manual for your 1995 Chevrolet Cavalier would be the best place to find out exactly what type of engine oil is recommended. If you don't have your owners manual try the following RepairPal link to see if yours is available online - http://repairpal.com/automobile-owners-manuals-online.

You can also use 5 W30