Result, and notice about engine oil change

- Every oil is blended for the optimum result, so adding an additive can result in harmful mixtures. Just buy the best brand on the shelf, never change it, and when you start your engine, let it idle for about 15 seconds before moving off, thus you can be sure that the oil is warmed up a little bit and can reach to the most vital areas of your engine before you push the accelerator pedal. Every manufacturer today tell you not to let the engine warm-up before driving off, but they mean don't let it reach to normal working temperature.. You can probably add another 100,000 km to your engine's life without one bottle of additive by doing this.

- Use an oil that can suit your performance needs. Synthetic motor oil is more expensive than minerals, but it lasts longer and provide more protection and better performance especially on sports cars.

- Choose the narrowest suitable span for your needs. A wider span means more polymers, and more polymers are not good for your engine. (Ex. 10W30 or 10W40? 10W30 has a narrower span than 10W40, thus requires few polymers. 10W40 requires more polymers than 10W30 to work at hot temp)

- Don't make a choice of a lighter base if there's no need in the name of temperature. (Ex. 10W40 or 20W50? 10W40 has the same 30 point spread with 20W50, but 20W50 has a 20W base which is heavier than 10W, thus a 20W50 oil needs less polymers than 10w40)

- You should change your oil filter at every engine oil change. The oil filter is a strainer that filters out the solid particles of dirt and metal that are picked up by the circulating motor oil. When the filter becomes clogged, a bypass valve allows these contaminants to continue circulating with the oil in the engine, damaging engine parts and creating sludge. Since there's no light on your vehicle's instrument panel to indicate a plugged filter, it's inexpensive insurance to change the oil filter at every engine oil change.

- In any case, it is important to change engine oil at least once a year.