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O       		Oxygen                                 

O       		Off                                   

O-RING  	O-Ring                                

O.A.    		Overall                                

O.D     		Outside Diameter                       

O.N.    		Octane Number                          

O.S.    		Off Side                               

O.T.    		Oil Tight                             

O/D     		Over Drive                             

O/S     		Over Size                              

OAL     		Overall Length                         

OAPEC   	Organixation of Arab Petroleum Exporting Countries

OASIS   	On-Line Automotive Service Information System

OBC     		On-Board Computer                      

OBD     		On-Board Diagnostics                   

OC      		Oxidation Catalyst                     

OC      		Oil Consumption                        

OC      		Open Chamber                           

OCC     		Output Circuit Check                   

OCS     		Oxidizing Catalytic Converter System   

OCT ADJ 	Octane Adjust                         

OCT.    		Octane Number                          

OCV     		Oil Control Valve                      

OD      		Outside Diameter                       

OD      		Origin to Destination                  

OD      		Outer Diameter                         

ODEC    	Overdrive Engagement Control           

ODI     		Oil Drain Intervals                    

ODO     		Odometer                               

OE      		Opposed-Cylinder Engine                

OH      		Overhaul                               

OH.     		Overhang                               

OHC     		Over Head Camshaft                     

OHC     		Overhead Camshaft                      

OHV     		Overhead Valve                         

OI      		Overdrive Inhibit                      

OL      		Open Loop                              

OLTBI   	Open Loop Throttle-body Fuel Injector

ON      		Octance Number                         

ONR     		Octane Number Rating                   

ONR     		Octane Number Requirement              

OP-KARMAN       Optical karman Voltices Air Flow Meter 

OPEC    	Organization of Petroleum Exporting Countries 

Oper    		Operated                               

Opt     		Options or Optional                   

OR      		Octane Requirements                    

OR      		Overload Relay                         

ORG     		Orange                                

OS      		Oxygen Sensor                          

OS      		Over Size                              

OS      		Over Steer                            

OSAD    	Orifice Spark Advance Control System   

OSC     		Output State Check                    

OTCS    	Over-Temperature Control System        

OTS     		Oil Temperature Switch                 

OVV     		Outer Vent Valve                       

OWC     	One Way Clutch                         

OX1     		Oxygen Sensor1                         

OX2     		Oxygen Sensor2                         

OX3     		Sub-Oxygen Sensor3                     

OXD     		Oxidation Catalyst                     

OXS     		Oxygen  Sensor                         

OZ      		Ounce                                  

OZ SENSOR  	Oxygen Sensor