Here is a little snippet I found on the subject:
Matt Snider, project engineer in GM’s Fuels and Lubricants Group, has an answer:
“Vehicles are so sophisticated that oil is one of the last things that customers can have a direct influence over. There’s maybe some feeling that they’re taking care of their vehicle if they change their oil more often.”
Now, many people also make the argument, that it’s better to be safe than sorry, right? But that’s a nonsensical argument when the leading experts are all saying such frequent oil changes are simply not needed. There is no danger of being sorry. Your engine will be fine. But there is one real danger. The danger of pollution.
GM’s Matt Snider has said:
“If customers always just stayed with the 3,000-mile recommendation, they would be throwing away good oil.”
Product education specialist for Toyota, Chris Risdon, agreed. Advances in oil technology means that you can change oils much less frequently and protect the environment at the same time.
“If you’re doing it [changing oil] half as much, that’s 5 quarts of oil times 1.7 million vehicles a year — that’s a tremendous amount of waste oil that’s not being circulated into the environment.”
Waste oil is a serious problem that’s exacerbated by too-frequent oil changes. California Integrated Waste Management Board has campaigned against the 3,000-mile dictate for a while. The agency has reported that 153.5 million gallons of used oil is being generated in California every year, but only 59 percent of it is ever recycled. That’s a considerable amount of potential pollution dumped into the environment.
I've sent off several oil samples to Blackstone labs for analysis and have come to my current OCI's.
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