As some of you may know I just got my first project s10. Its a 1990 with the 2.5. This weekend Im gonna do a tune up, oil change, and some more stuff. What are the things I need to do for a tune up as this will be my first time tuning up an engine? My dad is gonna help me. Also what are some additives I could use to clean the engine, carb, etc. and help it run a little better. Also, my SES light came on while my dad was driving it any ideas? I also have a tiny oil leak, where are some places the 2.5s are prone to leak and how much to fix myself? Sorry for the long post i just have a ton of questions about my new truck.