Here's a silly question

I use Mobil 1 10W30 in the race car and change it once a year. I also use it in my V10 tow vehicle and change it every 6000 miles.

I use what ever is on sale 10W30 mineral oil in my 400,000+ mile Dakota 5.2 and change it whenever I think about it. Usually anywhere between 5000 and 7000 miles.