I just bought a 1998 cherokee classic i took off the engine oil cap and i looked inside... i can see inside of it... does it need oil in there bc when it runs its like doesnt want to move and my antifreeze box is below add and i mix 50 50 and i put it in there will that box help cool my engine bc it is running hotttttt.....

 

Jeeps run hot, its just what they do.
If your really concerned about the heat, do a full fluid change, transmission, oils, antifreeze, any fluid you can find in that car, drain it, replace it. thats usually step one after buying a used jeep.
Did you buy the truck from a private owner or a dealership?
Dealers generally change all the fluids before you buy it, especially if its been sitting on the lot for a while.

 

wat kind of ail and oil filter u use and wat kind of oil

 

I use a pennzoil filter, but to be honest, unless you are beating the **** out of your truck, it doesnt really matter, just keep up with oil changes.
10w40 high mileage oil, my truck has 170,000 miles, and im expecting to get another 170,000.