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2. When Should You Change Your Oil? - AOL

   www.aol.com/change-oil-183100994.html

   Conservative estimates for oil-change intervals used to be as low as 3000 miles, before significant improvements in fuel-delivery systems, engine materials, manufacturing methods, and oil chemistry.

3. 3,000 mile myth - Wikipedia

   en.wikipedia.org/wiki/3,000_mile_myth

   With modern synthetic oils and new tests such as BMW's LL ("long life") oil specifications, most current cars can go over 6,000 miles (9,700 km) before needing an oil change. Even most modern conventional oils (also called mineral oils) can take a car engine at least 5,000 miles (8,000 km) before needing an oil change. [1] [2] [3] [4]

4. Motor oil - Wikipedia

   en.wikipedia.org/wiki/Motor_oil

   So periodic oil and filter changes should still be done with synthetic oil, but some synthetic oil suppliers suggest that the intervals between oil changes can be longer, sometimes as long as 16,000–24,000 kilometres (9,900–14,900 mi) primarily due to reduced degradation by oxidation.

5. Shell Rotella - Wikipedia

   en.wikipedia.org/wiki/Shell_Rotella

   The oil carries both the American Petroleum Institute (API) diesel "C" rating as well as the API gasoline engine "S" rating. Ratings differ based on the oil. Ratings differ based on the oil. Rotella oils, like the T3 15W-40, meet both the API CJ-4 and SM specifications, and may be used in both gasoline and diesel engines.

6. Synthetic oil - Wikipedia

   en.wikipedia.org/wiki/Synthetic_oil

   Synthetic oil is a lubricant consisting of chemical compounds that are artificially modified or synthesised. Synthetic oil is used as a substitute for petroleum-refined oils when operating in extreme temperature, in metal stamping to provide environmental and other benefits, and to lubricate pendulum clocks .

7. Oil additive - Wikipedia

   en.wikipedia.org/wiki/Oil_additive

   The choice of additives is determined by the use, e.g. the oil for a diesel engine with direct injection in a pickup truck (API Service CJ-4) has different additives than the oil used in a small gasoline-powered outboard motor on a boat (2-cycle engine oil).