In 1935, Caltex's predecessor, Standard Oil launched a multipurpose engine oil company under the name of DELO® - an acronym for Diesel Engine Lubricating Oil.

One of its first achievements was creating a compounded diesel engine oil that extended the cruising mileage for U.S. submarines during World War II. Throughout the years the Delo® brand has pioneered many successful engine oils and has a long history of being first to market with innovative technologies. Delo® was the first to document and reach a million miles without an engine overhaul using Delo® 400LE which has now been exceeded to 1.5 million miles. The Delo® brand is continually striving to meet and exceed industry standards and meet its customers' every changing needs.

The success of Delo® is based on its unique formulation, superior quality, extended serive protection and unsurpassed performance record. The Delo® story is an evolving process that has produced a family of engine oils to keep pace with the ever-changing needs of the industry.

Find out more about how Delo® products continue to provide world class protection. SEE BELOW.


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

ISOSYN Technology, proprietary technology unique to Delo®, combines Premium Base Oil, High Performance Additives and Caltex's Formulation Expertise to produce premium products that provide the protection and performance you need.

Delo® with ISOSYN Technology gives you the performance, protection and confidence to help your business go further.

Learn about the Delo Difference through bench testing results as well as field testing showcasing our customer's stories.

Delo® products protect your vehicles and equipment bumper to bumper.  We are so confident about the outstanding quality of Delo® products that we offer a bumper to bumper warranty you may not find from others.  

DP World achieves 57,000 hours using Delo® Gold Ultra SAE 15W-40.