This is one example, if you read this link of OCI's being shortened.
http://74.125.93.132/search?q=...&hl=en&ct=clnk&gl=us
http://legacy.signonsandiego.c...s_lz1d14sludge1.html
This letter written to shell implies quite a lot of info regarding low quality motor oil and proof!!!
http://www.motoroilmatters.org...Shell%20-%202009.pdf