How Long Does Engine Oil Last?
Generally speaking, synthetic motor oil will nearly always last longer than conventional oil, saving you time and money. But your specific synthetic oil change interval will depend on several factors, including operating conditions, motor oil quality and personal preference.
Why Does Oil Lose its Effectiveness?
Extreme heat hastens chemical breakdown (oxidation), altering the oil’s chemistry and preventing it from lubricating, cooling and protecting as designed. Sludge can form, which clogs narrow oil passages and prevents oil from reaching vital components, causing wear. Oxidation can also lead to increased oil viscosity, which negatively affects energy efficiency. Ultimately, the oil loses its effectiveness and must be changed.Contaminant build-up also affects oil life. Motor oil is formulated with detergent and dispersant additives responsible for holding dirt, soot (in diesel engines) and other contaminants in suspension and preventing them from depositing on engine surfaces or forming sludge. These additives are sacrificial in nature, meaning once they’re depleted, the oil’s effectiveness suffers and it must be changed.
Better Raw Materials Equal Better Oil
Like any other product, quality plays a big role, and in the case of motor oil helps determine service life and effectiveness. Synthetic motor oil is formulated using higher-quality raw materials than conventional oil, allowing it to perform better and last longer.
AMSOIL synthetic base oils don’t contain the impurities inherent to conventional oils, allowing it to more effectively resist chemical breakdown and extreme heat. Signature Series is also formulated with high-quality additives that effectively neutralize contaminants for long service life.
How Often Should Synthetic Engine Oil be Changed?
Most motorists now understand that synthetic motor oil performs better than conventional oil. It delivers improved wear protection, offers better engine cleanliness and lasts longer. Not as well understood, though, is how often you should change synthetic motor oil.
Not long ago, it was common to change conventional oil every 3,000 miles/3 months. The practice originated in the 1960s as a way to time oil changes with the seasons. The quick lube market picked up the idea as a way to keep traffic flowing, touting it as an “insurance policy” for your engine.
AMSOIL extended-drain synthetic motor oils, protect so well you can go longer between oil changes if you choose. Many motorists want to follow the guidelines in their vehicle’s owner’s manual. But lots of them still choose AMSOIL products that are capable of extending drains because they simply want maximum protection for their vehicles or the comfort of reserve protection should maintenance be delayed. Others desire the convenience of a once-a-year or twice-a-year oil change.
For these motorists, AMSOIL Signature Series Synthetic Motor Oil
is guaranteed for 25,000 miles/12 months
(15,000 miles/12 months in severe service). AMSOIL XL Synthetic Motor Oil
is guaranteed for 10,000 miles/6 months
, or longer where recommended by electronic oil life monitoring systems. They offer an outstanding combination of performance and value, guaranteed!