My 2001 Mitsu Eclipse has been on Mobil 1 5w30 since it's first oil change at 1500 miles. But I only put on less than 6,000 miles a year on it. So I do change the oil every 3,000 miles. Which is about once, or maybe twice a year
It currently has 66,000 miles on it.
I still have one more "free" oil change at the Nissan dealership that I bought my Pathy from. Maybe after that, I will switch to Mobil 1. After 7 months of owning, I've put on a little over 5,000 miles on it. I only drive it on the weekends.
Took this pic when I brought it back to the dealership for it's first oil change back in August. The service manager told me that I should be changing my oil at 5,000 miles intervals