Not unless you definitely know that your car is not running properly due to the oil being dirty or because of the tune up. I have seen many people spend a lot of money on vehicle repairs prior to the smog check only to find that their vehicle failed the smog check and the repairs performed were not at all related to the reason the vehicle failed the test. Since the retest is discounted for thirty days, bring it in first and let’s hope it passes the first time. This way you won’t throw your money away.
As for the oil, in my opinion, if it is bad enough to make a difference in the results of the test, you will notice it in the way your vehicle is running. If it is bad enough to make a difference in the way it is running, you will have other problems which will prompt you to take it into the shop for repairs long before your smog check is required.
Having said that, your oil should be changed every three thousand miles unless you don’t keep a car for very long. In this case you can follow the minimum factory warranty recommendation which is much higher. Remember, they are higher for warranty reasons only, not for longevity.
