What does HDDEO stand for?

Heavy Duty Diesel Engine Oil

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.
Business, finance, etc.

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Samples in periodicals archive:

Tour bus with Mobil Delvac and The Grascals logos unveiled at the 20th Annual International Bluegrass Music Awards * Band to make several appearances throughout the year at various industry events and retail locations * Tour bus to be filled with Mobil Delvac 1300 Super Heavy Duty Diesel Engine Oil FAIRFAX, Va.

Mobil Delvac to Sponsor The Grascals

Chevron Products Company today announced its API CJ-4 and API CI-4 PLUS heavy duty diesel engine oils meet the new Caterpillar ECF-2 specification.

Chevron API CJ-4 and CI-4 PLUS Heavy Duty Engine Diesel Oils Meet New ...

Chevron's Most Advanced Heavy Duty Diesel Engine Oil Ideal For Use in "Sprinter" Vans -- SAN RAMON, Calif.

Delo(R) 400 LE(TM) Gains Mercedes Benz Approval