Glossary

Select a letter to go to the terms beginning with that letter.

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HC

Hydrocarbons

HCCI

Homogeneous Charge Compression Ignition

HCFC

Hydrochlorofluorocarbon

HD

Heavy-Duty (vehicle or lubricant)

HDD

Heavy-Duty Diesel

HDDEO

Heavy-Duty Diesel Engine Oil

HDS

Hydrogenated Styrene Diene

HEUI

Hydraulically Actuated Electronically Controlled Unit Injectors

HEV

Hybrid Electric Vehicles

HFC

Hydrofluorocarbon

HFFI

Heavy Fuel Flow Improver

HFO

Heavy Fuel Oil

HFRR

High Frequency Reciprocating Rig

HGO

Heating Gas Oil

HP

Horsepower

HSD

Hydrogenated Styrene Diene

HSDI

High Speed Direct Injection (diesel engine)

HSE

Health, Safety, Environment

HSE (UK)

Health and Safety Executive

HTHS

High Temperature High Shear

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