I have four cars and have changed my oil for the last 20+ years.
For the past 4 years I have been changing the oil every 6 months since I only put about 6,000 miles during that time period.
I'm going to start changing the oil once a year as long as I don't exceed 15,000 miles per car (which I won't).
I also use Mobil 1 Delvac 15W/40 in all my cars and have been for 4 years.
I won't be using this oil for the new Camaro yet (cause I'm scared

)but eventually once it's at about 10,000 miles or more I will use it.
For the Camaro I will perform the hard break in and change oil for the first time at 50 miles.
I will then keep the hard break in until about 500 miles and then change the oil once more.
After that I will change the oil every 6 months or 5,000 miles.
I can offer no scientific proof for the above recommendations.