I recently changed my '07 Camry Hybrid oil for the first time to Mobil 1 synthetic. Before I had my mechanic change my oil every 5k miles. My question is, now that I'm using Mobil 1 synthetic, how often should I change my oil? Every 5k, 7k, 10k? Also does the fact that my car is a hybrid and doesn't use the gas engine as often mean that I can stretch out my oil change frequencies?