I dont know what kind of oil is in it. I think autozone brand. Thats the beauty of a beater.
My maintainance schedule on my beater car is better than Ryan's. his 1995 F150 now has 275k miles, and when the lifters start tapping/knocking, he adds a few quarts.
I remember years ago, my sisters friend bought a brand new Pontiac grand prix GTP in 98. She asked me to change her oil for her. So i brought it in the garage, and pulled the drain plug. Out came about a 3/4 of a quart of black sludge. I said wtf, when was the last time you had the oil changed???? She said she NEVER had it changed since new!! the car had like 23k miles on it at the time, and was like 3 years old. I suggested trading it in, but she kept it for a few more years after that.