TRIAX Fleet Ultra ESP CK-4 are our mainline heavy duty diesel engine oils. These are synthetic blend, API CK-4 Licensed products and fully compliant with most diesel trucks on the road (see data sheet). These products are also fully compatible with many European Euro 4 and Euro 5 diesel engines.

TRIAX Fleet Ultra oils are friction modified and contain our Nano-Boron and Moly friction management technology for outstanding wear protection, improved engine functionality, stiction prevention and improved durability.

An excellent choice for long haul trucks, pickups, including Powerstroke, Duramax, Cummins and many others.

• Excellent durability even in adverse conditions such as towing, hauling,
• High shear stability, stays in grade even under high loads and temperatures
• Exceeds all CK-4 related OEM specifications.
• 48% less wear vs the CK-4 specification requirements.
• Noticeably quieter engine operation
• Faster, quieter turbo charger spooling
• Eliminates stiction in HEUI injectors
• Large specification coverage across many OEMs. 
• Extended drain intervals: 15,000+ miles for pickups and over 100,000 miles for long haul semi trucks.

Available in 15W-40, 10W-40 and 10W-30 viscosity grades.