TOP TIER™ Performance Standards
TOP TIER™+ Gasoline Performance Standard
The TOP TIER™+ Gasoline Performance Standard will extend the current benefits to newer, higher-efficiency gasoline direct-injected (GDI) engines. The new Plus gasoline standard will include a GDI Fuel Injector Cleanliness Engine Dynamometer Test while monitoring for optimal emissions and combustion behavior.
Gasoline Plus Standards
TOP TIER™+ Diesel Performance Standard
The TOP TIER™+ Approved Diesel Performance Standard adds enhanced wear protection for modern high-pressure fuel injection hardware systems and greater fuel storage stability performance on top of the base-level features of detergency and cleanliness performance.
Diesel Plus Standards
TOP TIER™ Diesel Base Performance Standard
Today's TOP TIER™ Diesel Fuel Performance Standard has been streamlined into two levels of performance requirements for greater market flexibility and has been revised to focus on detergency and contamination cleanliness requirements.
Diesel Base Standards
A Higher Fuel Standard
Is TOP TIER™ Better?
What is TOP TIER™ gasoline?
