For years, automakers have been preaching the Gospel that the engine oil should be changed every 3 months or 3,000 miles, whichever comes first. This is because the engine oil formulations of decades relegated and damaged when left in the crankcase for longer than the specified interval. Heat, friction, and oxidation of the oil produces a mixture of particles known as muddy and full of mud. Sludge kills gumming up the machine with parts of oil and polluting oil is good. It can crystalize and hardened from heat the machine so that formations that cannot be removed except by the teardown of the engine. Mud deposits can be prevented with the use of high-quality engine oil, which will extend the life of the machine.
Modern vehicle engines operate at high heat and close tolerances. One reason for this is the Federal Emissions requirements that impose fines and sanctions if the minimum exhaust emission controls are not met. One of the steps automakers have taken to meet this requirement is to increase the temperature of the fuel Chamber with high compression engine, running leaner fuel systems, adjusting ignition timing for optimum emissions, narrowing the jacket water cooling system, and tightening engine oil tolerances. All of these steps results in the engine runs hotter exhaust emissions which emits less. However, tight tolerance puts increased demands on machines and lubricant formulations low will allow oil to break down more easily, thereby increasing buildup of mud.
New research, development and cooperation between automakers and companies producing lubricants has yielded good engine lubricant which meets the requirements of the machine is higher this time and appeared at the same time delaying the onset of a buildup of mud. This means that with modern high-quality oil like synthetic, oil replacement can be expanded for more than 3 months or 3,000 miles, traditional. In fact, synthetic oil is best used to show off the change but maybe because 10,000 km worries warranty and extended change intervals, law has ceased to be advertised.
Some manufacturers now boast of oil monitoring technology to help extend oil replacement intervals. An oil monitoring system see crankcase temperature, humidity, and the burn Chamber events when the engine is operating. The best systems can measure the useful life of the engine oil car to within 10%. The result of the application of this technology is that using normal vehicles, many manufacturers have adopted the recommended figure of 7,500 miles between oil changes. This of course assumes that the car owners will use engine oil recommended by the manufacturer of the car. To be on the safe side, the owner of DIY would be better off adopting a 5,000-mile oil change intervals.
Like other technology breakthrough, oil is a much better machine and the machine is much more protected, especially if synthetic oil used. The owner must also remember to always use a good quality filter when having the engine oil change. A Filter is a storehouse for dirt in the engine and the old filter will allow dirt and grit to circulate inside and at machined surfaces of the bearing and almost all metal mating surface. It will be damaged by the actions of the sandpaper grit supply, so that the wider oil tolerances, lowered the oil pressure and engine failure in the end prematurely.