Edmunds.com sorts through the facts and fiction surrounding motor oil, including the infamous 3,000 miles rule. Follow the address to find out more:
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http://www.edmunds.com/car-care/top-7-urban-legends-about-motor-oil.html
"4. Check the oil on the dipstick. If it's black, change the oil. Experts say this is a myth, as is the related notion that you can identify spent oil by smell. "That is old school," says Kristen Huff, vice president of Blackstone Laboratories in Fort Wayne, Indiana. "Oil is meant to get dark — it means it's doing its job," she says. As GM's Matt Snider says in this video, different additives change the oil's color. The bottom line: Black oil still has plenty of life left in it.
5. When you buy a new car, change your oil at 3,000 miles to remove metal particles from the engine break-in process. There might be a grain of truth to this, according to the experts at Blackstone. Oil samples from engines during the first 3,000 miles of driving show elevated "wear-in" metal levels, coming from the pistons and camshafts, says Ryan Stark, Blackstone's president. But he added, "To me, it doesn't make that much difference because if the filings are big enough to cause damage, they will be taken out by the oil filter."
However, a Honda spokesman says its cars come from the factory with a special oil formulation for the break-in period. Honda advises owners to not change the oil early. Stark said Blackstone Laboratories' test of Honda's break-in oil shows it contains molybdenum-disulfide, an anti-wear additive. But Stark said Honda is the only manufacturer he knows that's using special break-in oil. The take-away? If there are any special break-in recommendations from the manufacturer, follow them. And consider analyzing the oil at 3,000 miles.
6. Once you use synthetic oil, you always have to use it. This is a straight-up myth. In fact, the line between synthetic oil and petroleum-based oil is blurring because the two types of oil are often blended, says Edmunds Engineering Editor Jason Kavanagh. "As long as the oil meets the service and viscosity requirements set out in your owner's manual, you can switch back and forth as much as you want," he says. For more information, watch this short video."
Courtesy of Edmunds.com
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