Rep Power: 0

Ok so I just bought a 04 Honda civic ex couple with a manual transmission the car has 71xxx miles I want to do an oil change will it make a difference to go full synthetic or stay conventional?

 
Rep Power: 244

Doesn't matter. Synthetic is better so I would switch to synthetic. It actually tells you in the manual that you can use synthetic as long at it meets the same standards (which all oil does now) and is the correct weight (5w20). I use full synthetic in my 01.