Delo® products are designed for on- and off-highway applications, ranging from truck and bus transportation to construction, mining, agriculture, power generation and high-speed diesel engines in marine service. Across industries, Delo's premium lubricants deliver world-class protection, performance and maximum operational reliability in a wide range of operating conditions.

The Delo range consists of top performing heavy duty diesel engine oils, coolants/antifreeze, transmission fluids, gear oils, greases and hydraulic oils. Delo with ISOSYN® Technology gives you the performance, protection and confidence you need to help your business go further.

Oil change intervals for Delo diesel engine oils depend on the specific engine type, how the vehicle is used, ambient conditions, and manufacturer recommendations. However, the Delo range includes products designed for "extended drain" intervals, such as Delo FleetPRO and Delo Gold Ultra. For the exact change interval for your vehicle and a specific Delo oil, consult your vehicle's owner's manual and follow the recommendations of the equipment manufacturer.

Based on the product listings, the most frequently offered viscosity grades for Delo heavy-duty diesel engine oils are SAE 15W-40 and SAE 10W-30. Many popular oils like Delo 400 MGX, Delo Gold Ultra, Delo FleetPRO are available in SAE 15W-40, along with Delo 400 SLK and Delo 600 ADF.

Modern engine oil specifications include a variety of performance requirements that encompass various duty cycles and engine displacements. These specifications require lubricant suppliers to run multi-cylinder engine tests to demonstrate durability protection across different modes of operation.

Caltex Delo Lubricants offer a simple online tool to allow on and off-highway customers to select what products are right for their equipment. You can find out more here: Caltex products selector. 

Yes. Many Delo products are developed for use in mixed diesel fleets and can often serve in engines from different manufacturers, including older and newer models, if the oil meets the required performance specifications and OEM approvals.

Certain Delo oils, particularly those formulated with advanced additive technology (such as Delo Gold Ultra with ISOSYN® Technology), are suitable for modern engines equipped with emission controls like Selective Catalytic Reduction (SCR) and Exhaust Gas Recirculation (EGR). Always check product specifications for compatibility with your engine’s emissions technology.

ISOSYN® Technology is the combination of our premium base oils, high performance additives, with Caltex’s formulation expertise that provides superb diesel engine parts protection, all at an outstanding value. Delo with innovative ISOSYN® Technology delivers industry leading durability, reliability and efficiency.  It works in synergy with the changing conditions in your engine to maximize protection, optimize performance and extend oil life.