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Never really sat down and figured it out. I would say that at I owned at least 10 of them for 8 years +. Some I turned over very quickly for a variety of reasons. Others I kept for a 3-4 years. The point I was making it that the basic assumption in your statement was wrong. All of them got their 1st oil change at the 1,000 mile point. At 70 years old with stage 4 cancer, I suspect my high volume purchase days are coming to a close. [/quote]
May God be with you every second of every day , untill he carries you home .
Wyr
God bless
PS We bought a new 2015 Chevy Sonic a couple of years ago .
I was concerned , old theory of the early miles of operation wearing all the burs and rough spots smooth . Wanted to get all that debris out of the oil . Changed the oil at ~ 50% OLM .
The oil was dark , which I read is not automatically a bad thing . Can not remember seeing any metal in the oil .
The car is the 1.8l 4 cylinder . It uses a paper cartridge filter , so I do not have to cut open a metal filter . Can not remember metal in the / on the filter .
http://www.rockauto.com/info/342/PF2257G_Primary__ra_t.jpg
I am guessing , this whole topic depends on many things .
A How cleanly the engine was assembled & how clean the parts were .
B Quality of the engine / parts material .
C Maybe , the specific design of the engine / parts .
D If the engine was " broken in " at the factory , then an oil / filter change done . How such " break-in " was done .
E How smooth the parts were finished to and how tight the tolerances were held .
The days of the flat tappet cams seem to be gone , for new vehicles . So , some of the concerns of " break in " oil may be gone also .
This is only the 2nd new car we have owned . So , I am far from an expert . I have many more questions , than answers .
God bless
Wyr