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2. 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]

3. 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.

4. Hydraulic tappet - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_tappet

   As mentioned, one may avoid this by using the manufacturer-recommended grade of engine oil, and by not exceeding the prescribed oil change interval. It is a myth that in certain circumstances, a lifter can "pump up" and create negative valve clearance. The engine oil pump cannot generate enough pressure to cause "pump-up".

5. Service (motor vehicle) - Wikipedia

   en.wikipedia.org/wiki/Service_(motor_vehicle)

   A motor vehicle service or tune-up is a series of maintenance procedures carried out at a set time interval or after the vehicle has traveled a certain distance. The service intervals are specified by the vehicle manufacturer in a service schedule and some modern cars display the due date for the next service electronically on the instrument panel.

6. Motor oil - Wikipedia

   en.wikipedia.org/wiki/Motor_oil

   This has led to a campaign by the California EPA against the "3,000-mile myth", promoting vehicle manufacturer's recommendations for oil change intervals over those of the oil change industry. The engine user can, in replacing the oil, adjust the viscosity for the ambient temperature change, thicker for summer heat and thinner for the winter cold.

7. Harley-Davidson Panhead engine - Wikipedia

   en.wikipedia.org/wiki/Harley-Davidson_Panhead_engine

   The Panhead is an overhead-valve Harley-Davidson motorcycle engine, so nicknamed because the rocker covers resembled cooking pans. The engine is a two- cylinder , two- valve -per-cylinder, pushrod V-twin , made in both 61 c.i. (EL) and 74 c.i. (FL, FLH) displacements.