I have a 2001 Neon (5sp) with 34k on the clock. Since I've owned it at 16k, it has seen only Mobil 1 10w-30 at 3-5k intervals. The last oil report with almost 5k on the oil showed that I could probably stretch it to 5.5k next time. About 98% of my driving is highway, as I drive 60 miles a day on the highway to and from work, plus more highway on the weekends. I also autocross my car (SCCA solo 2, if you are unfamiliar with autocross, its 40-70 second runs against the clock through a pylon course to determine the best driver/car setup) during the summer on average of once every 2 weeks for a total of about 7-10 a year. In addition, once or twice a year I will take my car out to lapping days at local area tracks (my fav is www.grattanraceway.com ). Now taking my driving into consideration, do you think it would be ok to make the change back to dino oils? Rather then spend 20 on each oil change at 5-6k, I figure it might be better to spend 5 bucks at 3k for each oil change. Any thoughts?