Hey guys. I'm new to this site and i have a question. I have a 07 cobalt with a couple grand worth of bolt on performance modifications. I do some highway, city, and high rpm race driving. As you can see I use my car for everything. I ran dino oil in it until it was broken in. I switched to valvoline synthetic at 5500 miles on the odometer. I now have 10,469 miles on the car with the first synthetic oil change currently in the motor, therefore i have about 5000 miles on the oil. Considering my driving conditions, do I still change my oil every 7500 miles with synthetic? or because I do a fair amt of racing, should i be looking to dump it at a earlier interval? Not sure what to do. P.S. I use purolator pure one filters which is currently in the car as well and i also give the car about 2 min. warm up time every time I start it. Opinions welcome thanks