I used to think it was important... But like i have learned from a few other members on the Forum, Oil is oil. It will get dirty faster than the expectancy of 3k for conventional or 5k with synthetic. I used to do only synthetic on my car every 4-5k miles for 1.5 years until yesterday where i did a conventional oil change. As of lately i realized it honestly makes no difference. Even took it to the drag strip yesterday, Still felt confident on the conventional.