Caltex Delo® | Quality Engine Oil and Lubrication

LubricantsDelo® Difference

Delo®  has been delivering end-to-end protection to critical engine parts for over 80 years. ISOSYN® Technology is why Delo products provide reliable protection to critical engine parts. Discover the Delo® difference today.

The Promise DELO® Delivers

For our customers, Delo with ISOSYN delivers value that:

  • Provides excellent soot dispersion and sludge protection
  • Helps protect critical engine parts
  • Provides engine durability and extended service protection
  • Helps minimise operating costs


What is ISOSYN® Technology?

Using our expertise and experience, we combine premium base oils with high-performance additives to deliver engine parts protection that rivals synthetics. This combination delivers outstanding performance for Delo® customers.

ISOSYN® Technology is Delo®'s Differentiator

ISOSYN® Technology represents decades of experience in diesel engine parts protection, and it is how we formulate our top-tier Delo® products.

ISOSYN® vs Conventional

Rather than using conventional solvent dewaxing technology, we make base oils with Chevron’s ISOCRACKING and ISODEWAXING catalyst. Our high-performance additive formulation provides superb soot dispersion and prevents deposit build-up. Combining our formulation with ISOSYN® Technology provides Delo® customers with protection, performance, and confidence.


Base oils are made with ISOCRACKING and ISODEWAXING catalysts.

We add high-performance additives that deliver excellent soot dispersion and prevent build-up.

The combination helps keeps engines clean for miles.


Conventional Solvent Dewaxing Base Oils.

Additives for economical heavy-duty lubricants don’t deliver the soot dispersion that Delo® does.

Sludge and deposit build-up with a conventional oil base product.

Delo®: A History of Firsts

Going Further Since 1935. Delo®'s long history of technology and formulation expertise has successfully provided the lubrication protection customers have required over the years to keep their vehicles, equipment and businesses running efficiently.    



Marketed the first compounded diesel engine oil under RPM Diesel Engine Lubricating Oil (DELO) brand, making high-speed diesel engines feasible.

CalTex founded as a joint venture of Standard Oil of California.



First in the world to develop compound diesel engine oil that could be used in any diesel engine - adopted by the U.S. Navy. Delo becomes a registered trademark.



First in the world to develop a successful multi-grade engine oil - SAE 15W-40



First grease capable of extending lubrication intervals of heavy-duty equipment to 30,000 km.



First to document 1.6 million-KM, no overhaul engine life in Caterpillar 3406B.



Launch of Delo Gear ESI and Delo Trans ESI - first extended drain non-synthetic axle and transmission oils.



Delo ELC is first extended life coolant technology launched and approved as factory fill at Caterpillar under Cat EC-1 specification.



Documents the first 1.6 million-KM, no overhaul engine life for the three major U.S. engine manufacturers and is first to meet the performance levels of PC-7 (CH-4).



Chevron Delo products recognised for outstanding performance and honoured by Lubricants World magazine.



Delo products meet the API CI-4 Plus standard before official licensing.



Delo’s Extended Life Coolant formulation is the first to deliver 1.2 million-KM of service with no Extender required, and reached first 1.6 million-KM life in heavy duty trucks with the addition of an Extender.



Chevron launches Delo Grease ESI which provides extended service protection to 50,000 km.



Chevron receives SAE research award for "Extending the Boundaries of Diesel Particulate Filter Maintenance with Ultra-Low Ash - Zero Phosphorus Oil".



Launched Delo 400 MGX SAE 15W-40 — the first low emission oil (API CJ-4) formulated to protect diesel engines using up to 5000ppm diesel fuel sulphur levels.



Delo Grease ESI, the first grease to document 80,000 km re-greasing intervals on over the road trucks for wheel bearings, chassis, U-Joints and fifth wheels.

Delo 400 LE Synthetic SAE 5W-30 becomes first SAE 5W-30 diesel engine oil to achieve 160,000 km oil drain interval with NO oil filter change in Detroit Diesel DD15 diesel engines.