Exhaust & Emission Systems
More informationAt the Global Parts automotive store, we offer a wide selection of original used car parts, including exhaust systems and exhaust gas cleaning parts for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen and others. Each of the parts we offer undergoes quality control so that you can be sure that you are receiving a top-class product.
Make
Category
Subcategory
Condition
In Stock
Price
Part no. A2761401360
Mercedes W212 Engine EGR Valve Exhaust Valve Cooler M276 Petrol A2761401360
€237.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8591893
Vacuum Box BMW F20 LCI G01 G05 G11 G20 G30 Water Pump Coolant Actuator 8591893
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. BK2Q9D475CB
EGR Valve Ford Transit Peugeot Boxer 2.2 Diesel Gas Recirculation BK2Q9D475CB
€47.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8037074
BMW X5 E70 Rear End Exhaust Tip Heat Protection Ring Right O/S 8037074
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 9845749
BMW F44 Exhaust Heat Shield Insulation 9845749
€66.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 9672189780
Peugeot 207 1.6 HDI Diesel Exhaust Manifold Heat Shield Plate Cover 9672189780
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7530285
BMW X3 Z4 E83 E85 E87 E90 Lambda Probe Monitor Sensor Exhaust 7530285
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8511638
Vacuum Box BMW F10 F11 F20 F21 F30 F31 F32 Diesel Exhaust EGR Actuator 8511638
€32.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 07L906265
Audi S5 8T 4.2 FSI CAUA Petrol Exhaust Oxygen Lambda Probe Sensor 07L906265
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0009954233
Exhaust Clamp Mercedes C156 W176 Clip Pipe Connector Bracket A0009954233
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2711410840
Mercedes W204 M271 EGR Valve Bracket Exhaust Gas Valve Mount Holder A2711410840
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8238075
BMW 7 E65 E66 Heat Shield Wrap Insulation Tunnel Tank Under Cover 8238075
€54.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6541423400
Heat Shield Mercedes W213 C238 Diesel OM654 Exhaust Heat Cover A6541423400
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7812314
Mini Cooper R55 R56 LCI R60 R61 Exhaust Manifold Catalytic Diesel 7812314
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 079253033AK
AUDI S5 8T Quattro Petrol 4.2 FSI V8 Exhaust Manifold Cyl. 5-8 079253033AK
€51.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8200748440
Renault Scenic III 1.5 DCI K9K Turbo Charger Heat Shield Cover 8200748440
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6511400209
Mercedes SLK R172 250 CDI Diesel Engine Exhaust Manifold A6511400209
€56.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6561404600
Engine Exhaust Manifold Mercedes W204 W222 OM656 Diesel Manifold A6561404600
€113.95
Free delivery - Tue, Jun 10
If paid before 14:00
Part no. A6121420101
Mercedes W163 W211 OM612 OM647 Diesel Exhaust Manifold A6121420101
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 07L906262
Oxygen Sensor Audi A4 B8 S5 8T Exhaust Lambda Probe Unit 07L906262
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6541405700
Mercedes W205 W447 OM654.920 Diesel EGR Valve Engine Exhaust Cooler A6541405700
€113.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 671BM
Jaguar XF X250 3.0 D Diesel Aftermarket Exhaust Pipe Scorpion 671BM
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8642775
BMW F40 G20 G30 G32 Mini F55 F56 F60 Sliding Bar Strip Exhaust Manifold 8642775
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7804381
EGR Valve BMW E90 E87 E92 E60 Diesel M47 M57 Exhaust Gas Recirculation 7804381
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6070960000
Mercedes W176 W246 Heat Shield Gearbox Transmission Insulation Plate A6070960000
€56.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6561421000
Mercedes W213 Diesel Engine OM656 Exhaust Manifold Holder Bracket A6561421000
€56.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 3440442
BMW X3 Series E83 N46 2.0i Exhaust System Manifold Petrol 3422988
€37.95
Free delivery - Tue, Jun 10
If paid before 14:00
Part no. 7616850
BMW F20 F21 F30 F31 F32 Exhaust System Silencer Rubber Mounting Mount 7616850
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 1473500QAB
Nissan Qashqai J10 Renault Trafic II Megane III 2.0 dCi EGR Cooler 1473500QAB
€94.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A1704701159
Mercedes R171 SLK Petrol Activated Charcoal Filter Carbon Fuel A1704701159
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 9820566180
Citroen Relay III Oxygen NOx Lambda Exhaust Sensor HDi Diesel 9820566180
€56.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 9803842980
Peugeot Partner B9 1.6 HDI EGR Valve Pipe Hose Line 9803842980
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7513963
BMW X3 5 7 Z4 Series E60 E61 E65 E83 E85 Lambda Monitor sensor L=990MM 7513963
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 118342379R
Vauxhall Vivaro Renault Trafic Nissan Nv300 Heat Shield Protector 118342379R
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2761401334
Mercedes W205 M276 Left Side Heat Shield Insulation Turbocharger A2761401334
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8200873678
Opel Vivaro Renault Trafic 2.0 Diesel EGR Cooler 8200873678
€37.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6561400160
EGR Line Mercedes W213 W222 OM656 EGR Cooler Pipe Tube Hose A6561400160
€32.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8509030
BMW 3 5 Series E90 LCI F10 330d 530d N57 Diesel Oxygen Sensor Lambda 8509030
€37.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 03P131521B
Volkswagen Golf MK6 TDI EGR Valve Cooler Connecting Pipe Tube 03P131521B
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. BK2Q-9D475-CC
Ford Transit Mk8 2.2 TDCI Diesel EGR Exhaust Gas Valve BK2Q-9D475-CC
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2741420519
Mercedes W205 M274 Housing Exhaust Gas Recirculation EGR Valve A2741420519
€56.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6511411504
Mercedes W176 W246 OM651 Diesel EGR Pipe Valve Line Hose A6511411504
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7793825
BMW 1 3 5 Series F10 F20 F30 E90 LCI Petrol Oxygen Sensor Exhaust Lambda
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6261420001
Mercedes W205 OM626 Trafic Vivaro 1.6 DCI Diesel Exhaust Manifold 140045202R
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0009953633
Clamp Mercedes W205 Catalytic Converter to Particulate DPF Clamp A0009953633
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6511510245
Starter Cover Mercedes W906 OM651 Heat Resistant Plate Motor Shield A6511510245
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. OM642DOWNPIPE
Mercedes W221 OM642 Exhaust Pipe Front Exhaust Downpipe
€94.95
Free delivery - Tue, Jun 10
If paid before 14:00
Part no. 8509783
Exhaust Gasket BMW E90 Diesel N47 G30 G21 B57 Exhaust Manifold Gasket 8509783
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0065422218
Lambda Sensor Mercedes W204 W212 Oxygen Sensor Lambda Probe A0065422218
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2464902300
Exhaust Pipe Mercedes W176 W246 OM651 Front Intake Manifold Line A2464902300
€66.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0009052709
Mercedes W447 Lambda Oxygen NOX Sensor A0009052709
€75.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2044910147
Mercedes W204 Vibration Absorber Exhaust Damper A2044910147
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2034910241
Mercedes-Benz C-Class W203 W204 Diesel Exhaust Manifold Bracket A2034910241
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6511420067
Mercedes W639 OM651 Exhaust Gas Recirculation EGR Valve Part A6511420067
€32.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 03L129969L
Audi A6 C7 2.0 TDI CGLC Diesel Exhaust Manifold Turbo Heat Shield 03L129969L
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0075421618
Mercedes W176 W204 W205 W212 W221 W906 Lambda Oxygen Sensor Probe A0075421618
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6510960468
Engine Mount Mercedes W906 OM651 Right Heat Resistant Plate Shield A6510960468
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7595353
BMW F20 F21 F30 Mini R56 Petrol Engine Regulating Lambda Probe 7595353
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 147173974R
Renault Megane Kadjar Captur 1.5 dCi EGR Valve Housing EGR Pipe 147173974R
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 0281006005
Audi Q7 4L Exhaust Pressure Sensor DPF Filter Sensor 0281006005
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 079131101AR
Audi S8 D3 Quattro 5.2 FSI Secondary Air Pump Valve EGR Valve 079131101AR
€32.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 022253035AF
Audi A4 B7 2.0 TFSI Exhaust Manifold Engine Heat Shield Protection 022253035AF
€28.95
Free delivery - Tue, Jun 10
If paid before 14:00
Part no. 8604889
Mini Cooper One F55 F56 Lambda Monitor Sensor Probe 8604889
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7848483
BMW F80 M3 F82 F83 M4 Lambda Probe Oxygen Monitor Sensor 7848483
€51.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8515502
BMW F26 F30 F07 N57N Catalytic Converter Holder Carrier Mount Bracket 8515502
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 55573459
Fiat Doblo 2.0 Diesel EGR Regulator Vacuum Valve 55573459
€37.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8595135
Lambda Sensor BMW F40 F48 Diesel Exhaust Oxygen Sensor Cable Probe 8595135
€66.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0009051206
Mercedes C253 Diesel OM651 Exhaust Gas Temperature Sensor A0009051206
€56.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0081533728
Mercedes W212 Diesel Gas Exhaust Temperature Probe Sensor A0081533728
€27.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 149566215R
Renault Trafic Turbo Boost Pressure Solenoid Valve Unit 149566215R
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2700164600
Mercedes C117 W176 W246 M270 Heat Shield Plate Cover A2700164600
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 059131503AK
Audi SQ5 8R 3.0 TDI CGQB Diesel Engine Recirculation EGR Valve 059131503AK
€75.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2044920244
Mount Exhaust Mercedes W204 C207 W212 Rubber Mounting Holder A2044920244
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8200406337
Renault Trafic Vauxhall Vivaro Lambda Sensor Exhaust Control Unit 8200406337
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0009056704
Temperature Sensor Mercedes W176 W246 Diesel Exhaust Gas A0009056704
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 04E906262A
VW Volkswagen Golf Mk5 Petrol Exhaust Lambda Oxygen Sensor 04E906262A
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0009059803
Mercedes W166 W205 W213 W222 W253 Petrol Lambda Sensor Probe A0009059803
€75.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 059906627M
Audi A6 A7 4G 3.0 TDI Diesel Pressure Conventer Valve 059906627M
€56.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2054910121
Mercedes W205 Diesel OM626 Exhaust Lower Tensioning Strap A2054910121
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8574794
EGR Exhaust Cooler BMW F20 F21 LCI Diesel B37 Heat Exchanger 8574794
€142.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0085423018
Lambda Probe Mercedes C216 W204 W221 OM274 Catalytic Converter Lambda Sensor
€51.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6541400500
Mercedes W212 OM651 Holder Mount EGR Cooler Bracket A6541400500
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 9681852780
Peugeot 308 Lambda Sensor Diesel Oxygen Probe Exhaust Sensor 9681852780
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 226447142R
Renault Trafic II 2.0 DCi Diesel Lambda Sensor Oxygen Sensor Probe 226447142R
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 8518698
BMW F10 Exhaust System Rubber Seal 8518698
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7557710
BMW E81 E82 E90 E91 E92 Temperature Sensor Exhaust 7557710
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2114910947
Rubber Mounting Mercedes W204 W212 Exhaust Hose Mount Support A2114910947
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7837097
BMW 5 6 E60 M5 E63 M6 Exhaust Manifold EGR Valve Air Pump Cylinder 6-10
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 057253034AL
Audi Q7 4L 4.2 TDI BTR Diesel Exhaust Manifold Right O/S 057253034AL
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 9674950180
EGR Pipe Peugeot 308 3008 1.6 HDI Diesel Engine Valve Line Hose 9674950180
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2134903502
Mercedes W205 W213 C238 C253 Exhaust Carrier Bracket Mount Holder A2134903502
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6400900154
Mixing Chamber Mercedes W169 W245 OM640 Diesel EGR Valve Housing A6400900154
€32.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 7811913
BMW 1 3 5 Series E60N E81 E87N E90N LCI E92 EGR Temperature Sensor DIESEL N47
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A0009059704
Mercedes W205 W213 OM654 Diesel Exhaust Gas Temperature Sensor A0009059704
€32.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 03P1311521B
Volkswagen Sharan 7N EGR Cooler Pipe Tube Hose Line 03P1311521B
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6511400709
Engine Exhaust Manifold Mercedes W176 W246 OM651 Diesel Unit A6511400709
€23.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. 057253033AJ
Audi Q7 4L 4.2 TDI BTR Diesel Exhaust Manifold Left N/S 057253033AJ
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A2710900134
Mercedes W204 M271 Turbo Exhaust Manifold Heat Shield Plate Petrol A2710900134
€32.95
Free delivery - Wed, Jun 11
If paid before 14:00
Part no. A6511400860
EGR Valve Mercedes W212 Sprinter W906 OM651 Exhaust Gas Recirculation Diesel
€28.95
Free delivery - Wed, Jun 11
If paid before 14:00
Reliable parts for exhaust systems and emission filters – perfect fit for your car
Durable exhaust system components – for maximum performance and longevity
Exhaust systems and exhaust gas cleaning systems are essential elements of every modern vehicle. Their task is not only to reduce noise, but above all to reduce the emission of harmful substances, making driving more ecological and compliant with applicable standards. In the Global Parts automotive store you will find a wide range of used car parts for exhaust and exhaust gas cleaning systems , for brands such as BMW , AUDI , Volkswagen , Mercedes , Mini and others.
How does the exhaust system and exhaust gas cleaning system work?
Exhaust systems are advanced systems that consist of many key components that work together to effectively remove exhaust fumes and reduce their harmfulness. The most important elements are:
- Bypass valves – Controls exhaust gas flow, helping to optimize exhaust system pressure.
- EGR valves and parts – They are responsible for exhaust gas recirculation, which reduces nitrogen oxide emissions and improves fuel combustion.
- Secondary air pumps – They support the combustion process by supplying additional oxygen to the exhaust system, reducing exhaust emissions.
- Catalysts – They purify exhaust gases by neutralizing harmful substances such as nitrogen oxides and carbon monoxide.
- Exhaust Systems and Kits – Comprehensive sets of exhaust system components ensuring optimal engine operation.
- Collectors – They are responsible for discharging exhaust gases from the cylinders to further elements of the exhaust system.
- Exhaust pipes and tips – They ensure efficient exhaust gas removal and give the vehicle a sporty appearance.
- Clamps, clamps, flanges and mounting parts – Mounting elements enabling solid attachment of the exhaust system.
- Mufflers and resonators – Reduces engine noise, improving driving comfort.
- Exhaust system gaskets – They ensure tight connections and eliminate the risk of exhaust leaks.
- Lambda probes and O2 sensors – They monitor exhaust gas composition, optimizing the fuel-air mixture and improving combustion economy.
- Thermal shields, connectors and sleeves – They protect exhaust system components from overheating and improve their durability.
- Solenoid valves – They regulate the flow of gases in the exhaust system, improving its efficiency.
Each of these components is crucial to engine performance, driving comfort and environmental protection.
Why is it worth taking care of exhaust and exhaust gas treatment systems?
Regular maintenance and replacement of exhaust system and exhaust gas cleaning system components is essential for efficient and ecological engine operation. Neglecting these systems can lead to:
- Increased exhaust emissions, which may result in failing the technical inspection.
- Damage to key components such as catalytic converters or DPF filters.
- Decreased vehicle performance and higher fuel consumption.
At Global Parts we offer original used car parts , which undergo rigorous quality testing, ensuring reliability and durability.
How to choose the right parts for exhaust systems and exhaust gas treatment?
When choosing parts for the exhaust system and exhaust gas treatment systems , such as mufflers, catalytic converters or particulate filters, it is worth paying attention to:
- Matching to the vehicle model – Each make and model of car requires specific solutions. At Global Parts you will find exhaust and exhaust gas purification system components perfectly matched to BMW , AUDI , Volkswagen , Mercedes , Mini and others.
- Technical condition – Make sure components are free from damage, corrosion and cracks.
- Emissions Compliance – Make sure the parts you choose meet current emissions regulations.
Why choose used exhaust and exhaust aftertreatment system parts?
Used car parts is a great solution that allows you to save money while maintaining high quality. By choosing used exhaust systems and exhaust gas cleaning parts , you gain:
- Lower costs – Used components are much cheaper than new ones, but offer equally high quality.
- Ecology – You support recycling and reduce the amount of automotive waste.
- Wide selection – In our store you will find components for the most popular car brands.
How to take care of the exhaust system and exhaust gas cleaning?
To keep your exhaust system and exhaust gas cleaning system working efficiently for years, it is worth remembering a few rules:
- Regularly check the condition of the DPF filter and catalytic converter - clogging them can reduce the vehicle's performance.
- Keep exhaust pipes clean to avoid corrosion.
- Avoid short journeys, which may cause the exhaust system and its components to underheat.
In case of damage or wear of components, you will find the right used car parts at Global Parts that will restore full functionality of your exhaust system.
Summary: Exhaust systems and exhaust gas cleaning at the Global Parts Automotive Store
Exhaust systems and exhaust gas cleaning systems are the foundations of modern vehicles that combine ecology, efficiency and driving comfort. By taking care of their technical condition, you ensure reliability and compliance with applicable emission standards. The Global Parts automotive store cordially invites you to familiarize yourself with our wide range of original used car parts . Regardless of whether you are looking for car parts for BMW , Audi , Volkswagen , Mercedes , Mini and others - you will find them with us at competitive prices. We make every effort to ensure that every customer finds the right parts for their car/car with us, and in case of any questions or doubts related to the selection of appropriate components, we are happy to help! Please contact us - we are here to help you! For more information and curiosities, we also invite you to our automotive blog .