I just came across this from a link on the Yahoo homepage: http://autos.yahoo.com/maintain/repairqa/air_filters_oil/ques119_2.html;_ylc=X3oDMTFjMzlwcmQ0BF9TAzI3MTYxNDkEc2VjA3dlc3QtZWRpdG9yaWFsBHNsawNvaWwtY2hhbmdl Looks like they are just perpetuating the 3K OCI myth. No mention of using synthetic oils and they are pretty dismissive of doing UOAs based on cost alone (without mentioning any of the benefits of UOAs besides doing extened OCIs). There are so many reasons for doing at least moderately extended OCIs (environmental, time, cost if oil change is done at dealerships): I just don't know why the myth of the 3K OCI is so prevalent. Usually these yahoo articles (such as on finances) are little better researched and thought out than this one. Looks like there only source was oil companies.