I used to drain my Mobil 1 at the 3k mile mark - really for no good reason other than it made me sleep better at night.
Really, I did a lot of short trips in the Houston heat and felt my driving style put me into the "severe" category. Plus, the car at that time was '94 Ford Probe which ran *hot*. Used to kill plug wires every 30k miles.
I went to a 4k mile OCI about 1 year ago. Also switched to SuperTech Synthetic, as with the cost of Mobil 1 going up and with the addition of a baby boy, money got tighter here. Plus, we moved to the country (all trips are pretty much more than 10 miles) and I don't drive like a bat out of ____ like I used to.
Now that I find my time almost as precious as my money (our son is 18 months old now), I'll be going to a 5k change-out using SuperTech Synthetic 5W-30 in the 'stang and Lancer, and AMSOIL 0W-20 in our new '07 Tundra. Would like to go further, but I'm not yet comfortable with that in the Lancer or Mustang, and don't want to compromise my Tundra warranty.
I think the best oil change interval for anyone is what they feel comfortable with.
later,
b

Really, I did a lot of short trips in the Houston heat and felt my driving style put me into the "severe" category. Plus, the car at that time was '94 Ford Probe which ran *hot*. Used to kill plug wires every 30k miles.

I went to a 4k mile OCI about 1 year ago. Also switched to SuperTech Synthetic, as with the cost of Mobil 1 going up and with the addition of a baby boy, money got tighter here. Plus, we moved to the country (all trips are pretty much more than 10 miles) and I don't drive like a bat out of ____ like I used to.

Now that I find my time almost as precious as my money (our son is 18 months old now), I'll be going to a 5k change-out using SuperTech Synthetic 5W-30 in the 'stang and Lancer, and AMSOIL 0W-20 in our new '07 Tundra. Would like to go further, but I'm not yet comfortable with that in the Lancer or Mustang, and don't want to compromise my Tundra warranty.
I think the best oil change interval for anyone is what they feel comfortable with.
later,
b