I’m going to have to disagree with you there, Whitey.
Since neither you nor I know the conditions that the bmanno drives his car in, we can only speculate wether or not he needed to change the oil in his car between 3k to 5k miles.
Lets say that he lives in Byers, CO, just off Interstate 70 at exit 316, and drives everyday to Kanorado, Kansas, which is 136 miles due east on I-70. So that whole trip is in a 75mph zone, and all at highway speed. High rpms the whole way in his little high revving Civic.
What happens to engine oil at high rpms, in a small, hot running engine?
The oil gets whipped around pretty good, and smaller droplets turn into an oil mist. That oil mist gets sucked into the PCV system, and burned with the air and fuel in the combustion chamber.
A light weight 5W-20, which is what is most likely recommended for mbanno’s engine, will turn into mist and get burned easier than a heavier weight oil, like a 5W-30, a 10W-30, or a 10W-40. But that doesn’t mean that the oil that is in the crankcase needs to be changed out every 3k miles.
I bet if you tested a car run under those conditions, you would find out the oil is still in pretty good shape between 3k and 5k miles. I would bet the Mobil 1 oil would probably even be fine way past 10k miles.
Personally, I run my '07 Nissan Altima between 5k and 9k miles on each oil change, and have sent samples to Blackstone Labs with each and every oil change. I have used Kendall 5W-30 Semi Synthetic and Full Synthetic for every single oil change after the initial oil that Nissan put in the car when it was new, and every single oil analysis came back perfect for wear materials, and for lubricating properties.
Can we see your evidence that oil needs to be changed every 3k miles that you have accumulated?