Greg’s Petroleum Service Inc. is a local, family owned and operated fuel and oil distributor. Since opening in 1961, our commitment to deliver value through customer service, high quality products, reliability, and safety has set us apart.
And as our company continues to grow, family remains at the heart of how we think, how we treat our customers and how we treat each other. Here’s a quick look at how our story began, and how our dedication to serving you and your business has gotten us to where we are today.

How it all began…

Harold “Greg” Gregory started his career in petroleum at Ray Pratt’s gas station in Delano, California. Harold then went to work at Ken Teague's Standard Oil Distributorship, where he became a partner in 1961 and bought the business in 1963. In 1984, Standard Oil changed its name to Chevron Corporation, and Greg’s Petroleum Service was established.

Harold’s superior work ethic and genuine concern for his customers set the foundation for what our Company has become today.

The story continues…

Ron Mariani first came to work for his father-in-law, Harold, at Greg’s Petroleum Service as a fuel driver in 1979. Learning the business from the ground up, Ron worked several positions before becoming President, CEO and owner of the company in 1990. He has always had a deep appreciation for doing things the right way and has continued to build the company around pillars that value hard work, integrity, passion and community.

Kelvin Gregory, son of the late Harold Gregory, grew up helping his father with the family business. Over the years, he explored other career opportunities before returning to Greg’s Petroleum Service in 1993, eventually taking on the role of Sales Manager. Kelvin prides himself in building business relationships based on honesty, integrity, and standing behind his word; all of which have played a contributing factor to our company’s growth. In 2018, Kelvin has scaled back his role as consultant to help carry on the legacy his father started in 1961.

Where we are today…

Ron’s son, Greg, joined the team in 2016. He is currently the Sales Manager and is excited to be a part of the family legacy. In a world where technology is always changing, his knowledge and experience will play a major role in the future of our company; helping improve operational efficiency, sales and leading our team into the next generation.

Together, Ron, Kelvin and Greg have stayed true to Harold’s founding philosophy and have continued to build the Company around these values instilled from the Company’s beginnings – hard work, impeccable service, quality products, and remembering to always take care of the customer.

Today, Greg’s Petroleum Service has grown to serve hundreds of local companies in the agriculture, oil field, construction, industrial, fleet, retail and government industries. Our service area includes the San Joaquin Valley and beyond, including the Bakersfield, Delano, Fresno and Ventura areas. Services include commercial fuel delivery, lubrication solutions, fleet fueling cards, and both gas station and quick lube franchising opportunities. We pride ourselves on supplying high quality petroleum products and services while continuing to value customer relationships as highly as we did over 50 years ago.