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Originally Posted by SAUTO
I'd be interested in reading that article and the sae one mentioned if you happen to have a link
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Took a wee bit of digging but here it is. Interesting stuff.
Shouldnt be surprising oil companies want us to change oil as often as possible
https://www.sae.org/publications/tec.../2007-01-4133/
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A fleet of three vehicles was run in Las Vegas and oil samples were collected at various drain intervals from 3000 miles to 15000 miles. As in the previous study, the results showed that the aged engine oils provide lower friction and much improved wear protection capability. These improvements were observed as early as the 3000 mile drain interval and continued to the 15000 mile drain interval. The composition of tribochemical films formed on the surface with the 3000 mile drain interval is similar to that formed with the 12000 mile drain interval as seen before. These findings could be an enabler for achieving longer drain interval although several other factors must to be considered.
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