by 
The Curious Bag
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<h4 class="dechead">On One Hand: Manufacturers Say 3,000 Miles
Oil experts, especially oil manufacturers and service companies like Jiffy Lube, advise that drivers should change oil every three months or 3,000 miles regardless of whether the oil is natural or synthetic. According to these companies, hard driving and high temperatures can degrade oil viscosity, and frequent changes can prevent damage to a vehicle's engine.
On the Other: Experts Say Synthetic Oils Lasts Longer
A 2007 article in "Popular Mechanics" advises drivers with cars manufactured after 1990 who use synthetic oil to change that oil every 5,000 miles. According to the article, synthetic oil features more lubricants that allow it to flow more freely and provide protection over a greater duration of use.
Bottom Line
Although professional service companies recommend changing oil every 3,000 miles, automotive experts confirm that synthetic oil users should change a vehicle's oil every 5,000 miles.
Source:
Popular Mechanics: Synthetic or Mineral Oil? Setting the Record Straight
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