Chevron Lubricants, maker of the Delo ® brand of technologically advanced engine oils, lubricants and coolants, celebrated its 80 th year of Delo brand. Delo (Diesel Engine Lubricating Oil) has been established since 1935. In the 1950s, the Delo brand pioneered the first successful multi-grade engine oil and delivered one of the first two oils approved for Caterpillar Series 3 – RPM Delo Supercharged-3 Oil.