TRIAX Fleet Ultra ESP CK-4 are our mainline heavy-duty diesel engine oils. These are synthetic blend, API CK-4 Licensed and OEM Approved (Volvo, Mack) products and fully compliant with most diesel trucks on the road (see data sheet). These products are designed to deliver outstanding performance in most US and European Euro 4 and 5 diesel engines.

TRIAX Fleet Ultra oils contain our friction management technology, delivering 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.
• Noticeably quieter engine operation
• Faster, quieter turbocharger spooling
• Eliminates stiction in HEUI injectors
• Large specification coverage across many OEMs. 
• Extended drain intervals: 15,000+ miles for pickups and up to 100,000 miles for long-haul semi trucks.

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