The origin of the streamlined tankers – the Texaco Doodlebug

In the early thirties, the Texas Co embarked on an initiative to modernise its image and its tanker fleet. The innovative and futuristic tank truck that the company subsequently created is popularly known as the Texaco Doodlebug.

Five years before the 1938 Diamond T tank truck was manufactured, the Heil Co, in conjunction with the Diamond T Motor Car Company, worked with Texaco to produce the unmistakable, distinctive Texaco Doodlebug.

By researching the earlier relationship between these three companies, I found the answer to a question that I had about our 1938 Diamond T tanker.

With such little information available on the Texaco Doodlebug, I was pleased to find a couple of articles written by Michael Lamm on the subject. The first was back in 1995 in the Hemmings Motor News “Special Interest Autos” publication and the second was in 2015 and posted online for The Old Motor.

I also came across a very informative website at that explains the Heil involvement, and also has the Texaco Doodlebug specifications that were published in a November 1933 issue of Automotive Topics.

Background Information

Early in the 1930s, a large proportion of the American population was using coal to heat their homes. This was, of course, a very dirty, greasy product to handle and use. So the oil industry was keen to encourage American consumers to change over to oil as the primary home heating fuel.

When considering how best to promote this, Texaco decided to carry out a rebranding program to modernise its image and at the same time, produce a visually desirable, clean tank truck to deliver oil and gasoline.

It is suggested that the company engaged the services of two industrial design firms owned by Walter Dorwin Teague and Norman Bel Geddes to work on the design brief.

The ensuing corporate identity program saw the creation of the Texaco red T-star logo, new service station architectural designs and colour schemes, new white uniform styles and the famous large “TEXACO” block lettering that was affixed to the sides of the streamlined tank trucks.

One piece of the puzzle that I hadn’t solved when I published the post on the 1938 Diamond T block letters was who had actually designed the powerful, bold logo.  Thanks to Michael Lamm’s research and informative articles, this question has now been answered. Also in his articles, he referred to the Texaco tankers as “rolling billboards” – a very apt description!

Howard W Kizer, Superintendent of Automotive Equipment for The Texas Co, was in charge of the Texaco fleet and was apparently keen to build an eye-catching fleet that would not only grab the public’s attention, but also have a sanitary, clean appearance. The Texaco Doodlebug certainly delivered on both counts.

It is thought that Norman Bel Geddes and his team worked with Howard W. Kizer and C.A.Pierce, Chief Engineer for Diamond T, to come up with the radical, streamlined design.

The Heil Co then constructed the Texaco Doodlebug in conjunction with The Texas Co and the Diamond T Motor Car Co.

The unique and futuristic tank truck featured at The Chicago World’s Fair which ran from 1933 to 1934 to celebrate the city’s centennial.

The Doodlebug Details

  • The Heil Co constructed the streamlined tank body on a Diamond T chassis
  • A Hercules six-cylinder engine was mounted at the rear of the tanker
  • A top section of the tail housing could be opened to enable a mechanic to stand while he worked and have full access to the engine
  • The entire tail section could be removed if necessary to allow the removal of the engine
  • The driving compartment at the front was enclosed in double curved plate glass and gave the driver a 180 degree field of vision
  • The curved windshield wouldn’t be used in mass production until the release of the 1957 Chrysler Imperial
  • There were no running boards, hood, cowl or fenders
  • The wheelbase was 140″ (3.5 metres)
  • The total length was 26 feet (7.9 metres)
  • The total width was 92″ (2.3 metres)
  • The height at only 72″ (1.8 metres) was only 4″ taller than a 1934 Ford sedan
  • The short wheelbase, with the cab well forward and the engine at the back, produced a weight distribution ratio of 55% on the front axle and 45% on the rear
  • Heil installed a microphone at the rear in the engine compartment and a speaker in the cab so that the driver could hear the engine and know when to change gears
  • The tank truck had a 1500 gallon fuel capacity

The next two details came as a surprise to me and deserve special mention.

Firstly, it seems that there may have been only six Texaco Doodlebugs ever produced. What is known is that none of them survived. They may have been scrapped in latter years like so many of the successive streamlined tankers, or perhaps Texaco deliberately destroyed them when they came out of service.

Secondly, despite the colourised image shown above and the numerous red Texaco Doodlebug models that have been produced, it is noted from one source that these tankers were painted black.

26 March 2019:  Since publishing this post, I have discovered several articles written in the thirties that state the Doodlebugs were painted red. I cannot find any evidence whatsoever that supports the suggestion that these were ever painted black.

The remaining images are all taken at airfields and some photos highlight the incredibly low height of these spectacular tankers.

So many details on the Texaco Doodlebug have been lost forever and we will unfortunately never see a restored example. But thankfully, with the research that has been done by Michael Lamm and other historians, the memory and image of this unique, aerodynamically styled tank truck is being kept alive .

A little closer to home, a similar looking tank truck was photographed in Sydney, Australia, in late 1934.

Commissioned by the British Australian Petroleum Company, I cannot find any information on what chassis it was built on or who the tank manufacturer was.

Although the front appears to be similar, the Norman Bel Geddes stylish design at the rear of the Doodlebug certainly wasn’t replicated in this Australian tank truck.


Image Sources


Some of the smaller Diamond T parts – Update # 11


Repairs continue on the Heil tanker – Update # 12


  1. Great history! Too bad there are no survivors.

  2. Peter Tomkies

    Hi Guys
    Love the history and build updates
    Peter T

    • Sue Keys

      Thanks so much Peter.

    • Michel

      Most of the pictures are taken at Alamo airfield a.k.a .McCarran airport las vegas.
      The skyway cafe later became an autorent building.
      There’s 1 picture on the internet with the 6 doodlebugs were it appears that the first doodlebug is a lighter colour (maybe red)than the rest and they seem to be black.

      • Sue Keys

        Thanks for the info on the McCarran Airport. Since publishing this post, we have read articles written by Texaco in 1933 & 1935 in which they refer to the fleet of six Doodlebugs all being painted red. It was great to come across these publications from that time to verify the fleet colour. Thanks Michel.

  3. Graham Rollo

    love the background history, never had seen photos of the doodlebug, great

  4. Chris Green

    All the more reason to do what you’re doing to preserve this great historical truck! Keep up the great work!

  5. rick schaefer

    Thank you for the enjoyable reading. Especially like the references at the end. Will take me all day to go through them all…..but I will!

    • Sue Keys

      Great to hear you are going to read through all the articles. Thanks Rick.

  6. Shrappy

    They really are a thing of great beauty . Surely someone needs to build a replica !
    Cheers for the read .
    Shrappy 😎

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