Choosing a motor oil
today is no simple task when you are faced with shelves full of different
brands. Determining the right oil for your vehicle can be confusing as you must
decide which oil to use based on past experiences, choosing the brand your ‘Dad
always used’, or leaving that decision to your service advisor or mechanic.
While the basic
mechanics of an engine has remained the same over time, improvements in today’s
engines require different levels of key motor oil components. These changes
combined with emission standards have required motor oil manufacturers to make
changes in formulations in order to adapt to the “new standard.” With what
seems like a myriad of acronyms and numbers on the label, it can be difficult
to determine which one is the best oil for your vehicle.
Setting the Standards
The Society of
Automotive Engineers (SAE) sets the standards for motor oil performance in the
United States. Motor oil in its various viscosities or thickness is tested on
its resistance to flow when exposed to various degrees of temperatures found under normal vehicle operating
conditions.
While there are mono-grade oils available on the market, multi-grade oils are more common based on the consistency of the viscosity when used in a range of temperatures and driving conditions. The cold temperature standard (W grades) indicates the maximum cold temperature viscosity. The second number after the dash is the warm temperature standard or minimum hot temperature viscosity.
Quality Symbol
The American
Petroleum Institute (API) engine oil quality mark can be found on the motor oil
label as a Certification Mark “Starburst” and Service Symbol “Donut.” Both
symbols can help consumers identify quality motor oils, but each indicates different
standards met by the respective oils.
According to the American Petroleum Institute, motor oil displaying the API Certification Mark or “Starburst” signifies that, “The oil has met the current engine protection standard and fuel economy requirements of the International Lubricant Standardization and Approval Committee (ILSAC).”
The API Service
Symbol or “Donut” stands for motor oils that fall under the API “S” Service or
“C” Commercial categories. The letter “S” followed by another letter represents
oils suitable for gasoline engines. The letter “C” followed by another letter or
number denotes oil for diesel engines. To ensure companies who obtain API
licensing for their products continue to follow industry technical
specifications, the API Engine Oil program is supported by an enforcement
program and continuous monitoring.
Royal Purple SN Licensed
Royal Purple’s API
licensed motor oils are designed for new and vehicles under warranty,
delivering superior protection and improving performance in gasoline and diesel
engines. Royal Purple’s API SN licensed motor oils meet ILSAC GF-5 and Dexos1™1
performance requirements, and are fully compatible with mineral or other
synthetic oils. Royal Purple SAE SN motor oils are available in 0W-20, 0W-40,
5W-20, 5W-30, 5W-40, 10W-30, 10W-40, 15W-40 and 20W-50 multi-grade weights.
Royal Purple also produces mono-grade motor oils in SAE 30, SAE 40 and SAE 50
weights.
Royal Purple High Performance
To meet the needs of
vehicle owners who want to maximize their vehicle’s performance and protect
their high performance or modified engines, Royal Purple offers a high
performance motor oil for vehicles no longer under warranty. The Royal Purple High
Performance Street (HPS) series motor oils contain higher levels of zinc and
phosphorus anti-wear additives and Royal Purple’s proprietary Synerlec® additive
technology. This unique combination allows HPS to outperform leading synthetic
and conventional motor oils. HPS motor oils are suitable for both gasoline and
diesel engines and are available in: 5W-20, 5W-30, 10W-30, 10W-40 and 20W-50.
Knowing how to read
the label of the motor oil bottle is important when it comes to choosing the
best oil for your vehicle. Before you purchase your oil or take your vehicle in
for an oil change, consult your owner’s manual for the recommended viscosity.
Royal Purple suggests following the manufacturer’s oil change intervals when
using API licensed SN oil. Consumers using Royal Purple HPS can improve engine
performance and the overall life of their vehicle. If you have questions about
Royal Purple products contact the Technical Department at
rpautotech@royalpurple.com.