Timing Components & Kits
More informationAt the Global Parts automotive store, we offer a wide selection of original used car parts including chains, timing belts and assembly kits for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen and others. The chains, timing belts and assembly kits we offer undergo 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. A6070100400
Mercedes W415 Citan Renault Engine Crankcase Housing Cover Seal A6070100400
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 057130111L
Audi A8 D3 Q7 4L Engine Toothed Injection Pump Wheel Pulley 4.2 TDI 057130111L
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 038903315AH-1
VW Volkswagen Transporter T5 2.0 TDI CAAA Fan Belt Tensioner Unit 038903315AH
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 03D105255D
Volkswagen Golf Mk6 Crankshaft Pulley 03D105255D
Product currently unavailable
Part no. 7619245-3
BMW F10 F20 F21 LCI F30 B47 Diesel Vibration Damper Engine Crank Pulley 7619245
€42.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 057109105D
Audi A8 D3 Q7 4L Engine Toothed Belt Timing Pulley 4.2 TDI Diesel 057109105D
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 079105251AP
Audi A7 S7 4G 4.0 TFSI Vibration Damper Crankshaft Pulley Wheel 079105251AP
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A6512002170
Mercedes W204 W212 Diesel OM651 Belt Tensioner Pulley A6512002170
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 06E145255C
Audi S4 B8 3.0 TFSI CAKA Power Steering Pump Belt Pulley Wheel 06E145255C
Product currently unavailable
Part no. 059103525F
Audi A4 B8 A5 8T A6 C7 Timing Belt Cover Engine Casing 3.0 TDI 059103525F
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 04L105243
Audi Q3 8U Crankshaft Timing Belt Pulley Vibration Damper 2.0 TDI 04L105243
Product currently unavailable
-5%
Part no. A6542000070
Mercedes W213 W447 OM654 Diesel Belt Tensioner Pulley A6542000070
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7805958
Camshaft Pulley Mini R55 R56 Diesel W16 Timing Belt Gear 9657477580
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. A6512007501-1
Mercedes Sprinter W910 OM651 Diesel Belt Tensioner Pulley A6512007501
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A1562000570
Mercedes W204 Belt Tensioner Pulley Petrol Engine M156 Tensioner A1562000570
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7805949
Mini Cooper D R55 R56 W16 Gear Wheel Tooth Belt 7805949
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 059109191
Audi A4 B7 2.7 TDI BPP Diesel Engine Timing Belt Cover 059109191
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 057109093H
Audi Q7 4L 4.2 TDI Centre Toothed Timing Belt Cover Bracket 057109093H
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7807229
Mini Cooper D R55 R56 W16 Mechanical Belt Tensioner 7807229
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 1334617
Ford Transit Connect Timing Belt Cover Engine Casing 1.8 TDCi 4M5Q-6E006-AB
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A2720150001
Mercedes SLK R171 Cylinder Head Timing Cover 3.5 Petrol Engine A2720150001
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. A6512002170-1
Mercedes W204 Auxiliary Fan Belt Tensioner A6512002170
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 071402627
Renault Laguna II 1.9 DCI Diesel Engine Belt Tensioner Pulley 071402627
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 8600357
BMW F45 Mini F55 F56 Mechanical Belt Tensioner Engine 8600357
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 1S4Q-6A228-AF
Ford Transit Connect TDCi Belt Tensioner Tensioner Pulley 1S4Q-6A228-AF
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 9X233K738BA
Jaguar XF250 Belt Tensioner Bracket Mount Holder Diesel 9X233K738BA
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A2710107801
Mercedes W204 M271 Engine Timing Belt Cover Case A2710107801
€170.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 55210423
Engine Mount Bracket Saab 9-3 1.9 Ttdi Opel Vectra C 1.9 cdti Z19DTH 55210423
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. A6510300703
Vibration Damper Mercedes Sprinter W906 OM651 Engine Crankshaft Pulley Belt
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 9X236A228CB
Jaguar XF250 Engine Belt Pulley Alternator Tensioner Actuator 9X236A228CB
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 059109133T
Audi Q5 8R 3.0 TDI Timing Belt Cover Trim Panel Covering 059109133T
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 8624196
Mechanical Belt Tensioner BMW E60 E65 E81 Z4 E85 E87 E90 Petrol Engine 8624196
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A2720150501
Timing Cover Mercedes W212 Petrol M272 Chain Front Left Cylinder Head Cover
€37.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7598832
Belt Tensionier BMW F20 F30 Mini R56 Engine Belt Pulley Frictional Wheel 7598832
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 07Z105243A
Volkswagen Phaeton 3D 5.0 V10 Crankshaft Pulley Vibration Dampfer 07Z105243A
€56.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 55185074AX
Vauxhall Opel Corsa D Engine Belt Pulley Alternator Tensioner 55185074AX
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7790878
Mini One D R50 W17 Diesel Mechanical Belt Tensioner 7790878
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A2720150502
Mercedes SLK R171 Timing Case Front Engine Cover 3.5 Petrol R2720150502
€165.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 9802982780
Citroen Relay 35L III Timing Belt Cover Casing Trim Panel Diesel 9802982780
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 5751F9
Citroen C4 Peugeot 308 1.6 HDI Diesel Belt Tensioner Pulley 5751F9
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 8200761531
Renault Master 2 Vauxhall Movano A 2.5 DCI CDTI Belt Tensioner Pulley 8200761531
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. A6422001970
Mercedes Sprinter W906 Diesel OM642 Water Pump Belt Tensioner A6422001970
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A2720100514
Mercedes W204 W212 Crankshaft Housing Rear Oil Seal Cover M272 A1120110108
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7802146
BMW 5 6 E60 E61 E63 M57N M57N2 Engine Alternator Belt Tensioner Pulley 7802146
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7934465
BMW F30 LCI G20 G30 G11 X3 G01 Crankshaft Vibration Damper Pulley 7934465
€66.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 9654954880
Peugeot Expert Citroen Dispatch 2.0 HDi Diesel Belt Tensioner Pulley 9654954880
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 1748130
BMW X5 E53 Deflection Pulley Engine Belt Drive 1748130
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 03D145276E
VW Polo 6R 1.2 CGPB Drive Belt Guide Pulley 03D145276E
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 057103171AD
Audi A8 D4 Engine Timing Cover Panel Plate 4.2 TDI Diesel 057103173AL
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7524267
BMW E46 E81 X3 E83 Z4 E85 E87 E90 E91 Belt Tensioner Mechanical Pulley 7524267
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 06K103269F
Audi S3 8V 2.0 TFSI DJHA Petrol Engine Upper Cam Timing Chain Cover 06K103269F
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 1711500
Ford Transit Connect 1.8 TDCI P7PB Crankshaft Pulley 1711500 4M5Q-6B319-EA
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7800334
BMW E60 LCI Mechanical Belt Tensioner X3 E83 LCI F10 Diesel Engine 7800334
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 06K109210AF
Audi S3 8V 2.0 TFSI DJHA Petrol Engine Cam Timing Chain Cover 06K109210AF
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 9826368080
Citroen Relay 35L Belt Tensionier Engine Belt Pulley Frictional Wheel 9826368080
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 059103173CE
Audi Q7 4L 3.0 TDI Timing Chain Cover Engine Crankshaft Panel Diesel 059103173CE
€66.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7562509
BMW 3 Series E90 E91 E92 Petrol N53 Vibration Damper Crankshaft Pulley 7562508
€61.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A2700150400
Timing Cover Mercedes CLA X117 Petrol M270 Upper Timing Chain Cover A2700150400
€56.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 1K6867911E
VW Golf V 5 1K Rear Door Left Right N/O/S Seal Gasket Rubber 1K6867911E
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 8650996
BMW F20 F21 F30 F31 LCI B38 Petrol Vibration Damper Engine Pulley 8650996
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 057109077
Audi Q7 4L A4 B8 A5 8T Timing Chain Camshaft Sprocket 3.0 4.2 TDI 057109077
Product currently unavailable
Part no. A2702000170
Belt Tensioner Mercedes C117 W176 W246 Engine Drive Pulley A2702000170
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. A6512000070
Mercedes W204 A207 C204 C218 OM651 Diesel Belt Tensioner Pulley A6512000070
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7523884
BMW 1 3 5 E60 E87 E90 N52 N53 N54 Engine Timing Chain Guide Rail Bracket
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 135613805R
Timing Belt Cover Renault Clio II IV Engine Casing Panelling Diesel 135613805R
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7790448
BMW 1 3 SERIES E87 E90 E91 E92 E93 MECHANICAL BELT TENSIONER DIESEL 7790448
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 06H103269H
Audi Seat Skoda Volkswagen 1.8 2.0 TFSI Engine Cover Panel Trim 06H103269H
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 059109077E
Audi A6 C6 Q7 4L Timing Chain Camshaft Sprocket 3.0 TDI CASA 059109077E
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 038105243M
Audi A4 B8 Vibration Damper Crankshaft Pulley Wheel Diesel 038105243M
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. A6512001470
Guide Pulley Mercedes W176 Diesel OM651 Auxiliary Belt Pulley A6512001470
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 8200941079
Renault Master III Opel Movano B 2.3 DCI CDTI Belt Tensioner Pulley 8200941079
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 8585243
BMW X5 E70 Deflection Pulley Engine Belt Drive 3.0sd M57N2 Diesel 8585243
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 06E145255B
Audi S4 B8 S5 8T Power Steering Pump Pulley 3.0 TFSI CAKA 06E145255B
Product currently unavailable
Part no. 7838230
BMW E60 M5 E90 M3 Crank Schaft Belt Vibration Damper Pulley 7838230
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7838522
BMW E90 S65 Engine Distribution Timing Chain Guide Rail 7838522
€47.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 8580360
BMW 1 2 3 4 F20 F22 F30 F32 LCI Mechanical Belt Tensioner Holder Wheel 8580360
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 1079903
Ford Transit Connect 1.8 TDCI P7PB Gear Pulley Camshaft Drive 1079903
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 057109123Q
Audi Q7 4.2 TDI Diesel Engine Timing Belt Cover Panel 057109123Q
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A1772360040
Mercedes W205 W213 63 AMG Belt Tensioner Pulley M177 A1772360040 A1772000070
€89.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. CC1Q-19A216-CA
Ford Transit Mk7 Diesel Belt Tensioner Deflection Pulley Wheel CC1Q-19A216-CA
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 1427252
BMW X3 5 Series E34 E83 Mechanical Belt Tensioner Pulley 1427252
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7800562
BMW E60 LCI E81 E87 E90 E91 E92 E93 LCI Idler Deflection Belt Pulley 7800562
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. 9H2219A216DA
Land Rover Range Sport L320 3.0 D Belt Tensioner Pulley 9H2219A216DA
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 04E109121D
Audi A3 8V 1.5 TFSI Timing Belt Cover Panel Trim 04E109121D
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
-5%
Part no. BK3Q-6A228-BH
Belt Tensioner Ford Transit Mk7 2.2 TDCi Tensioner Pulley BK3Q-6A228-BH
Promo price
€23.95
€22.75
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7832456
BMW E60 M5 E63 E64 M6 E46 E90 M3 Engine Belt Tensioner Nut Cover 7832456
€37.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 074145283B
Tensioner Pulley Volkswagen LT 35 2.5 TDI Auxilary Belt Tensioner 074145283B
Product currently unavailable
Part no. 7791670
BMW X3 Series E83 2.0d M47N2 Engine Intake Tube Pipe Lubrication System 7791670
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 0XW145851A
VW Volkswagen Amarok NF Timing Belt Guard Cover 3.0 TDI Diesel 0XW145851A
€47.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 079109565F
Audi A8 D4 Q7 4L Timing Chain Camshaft Sprocket 079109565F
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. A6512001270
Mercedes Vito W639 Sprinter W906 Diesel OM651 Belt Tensioner Pulley A6512001270
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 03G145276
Audi A4 B8 Timing Belt Tensioner Pulley Idler Guide 2.0 TDI 03G145276
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 057109129T
Audi A8 D4 4H Timing Belt Cover Plate Panel 4.2 V8 Diesel Quattro 057109129T
€32.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7649371
Mini Cooper One F55 F56 F57 Petrol Deflection Pulley 7649371
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7502180
BMW E46 E60 E61 E63 E65 E70 E83 E87 Timing Sprocket Oil Pump 7502180
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 2465003
Mini R50 Timing Gear Sprocket 04777736AB 2465003
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 7509476-2
Mini Cooper S R52 R53 Auxiliary Hydraulic Belt Tensioner Part 7509476
€28.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. CK20-3C831-AA
Ford Transit Custom Diesel Belt Tensioner Pulley Wheel Bracket CK20-3C831-AA
€23.95
Free delivery - Thu, Dec 18
If paid before 14:00
Part no. 8663674
BMW F30 LCI G20 G21 G30 Water Pump Belt Pulley B46X B48X B58X Hybrid 8663674
€37.95
Free delivery - Thu, Dec 18
If paid before 14:00
Timing system components – belts, chains, and complete kits
Timing system components – belts, chains, and tensioners
Chains, timing belts and mounting kits are key components of the timing system, responsible for synchronizing the operation of valves and pistons in the engine. Their correct operation affects the efficiency, performance and durability of the drive unit. At Global Parts automotive store you will find a wide selection of used car parts, including chains, timing belts and mounting kits, ideal for BMW, Audi , Mercedes, Volkswagen, Mini and others .
Subcategories:
- Cogs – Key timing components that transfer drive from the crankshaft to the camshaft, ensuring precise synchronization.
- Tensioners and rollers – They are responsible for maintaining the proper tension of timing belts and chains, preventing them from loosening and skipping.
- Timing belts – Flexible elements synchronizing engine operation in drive units equipped with a belt timing system.
- Timing chains – Durable and resistant components used in engines requiring maximum reliability and long service life of the timing system.
- Chain and timing belt covers – They protect mechanisms against dirt, contamination and mechanical damage.
- Chain and timing belt kits – Kits containing all the necessary components to replace the timing system, ensuring full compatibility and durability.
What are the functions of chains, timing belts and mounting kits?
Chains, timing belts and mounting kits play a key role in keeping your engine running smoothly and efficiently:
- Valve and piston synchronization – By precisely controlling the opening and closing times of the valves, the timing system ensures optimal combustion of the fuel-air mixture.
- Minimizing power losses – An efficient timing system reduces friction and ensures efficient use of the energy generated by the engine.
- Engine Longevity – Regular maintenance and replacement of belts, chains and tensioners prevents breakdowns that lead to costly repairs.
- Damage Protection – Chain and belt covers protect timing system components from dust, oil and other contaminants.
- Used car parts such as belts, chains and tensioners offer economical and durable solutions for any engine.
Why is it worth taking care of the timing system?
A properly functioning valve train is essential to engine reliability. Common problems include:
- Timing belt wear – Abrasion, cracking or material aging can cause belts to break, which can cause serious engine damage.
- Timing Chain Stretch – Over time, the chain can stretch, causing valves to skip and become misaligned.
- Damage to tensioners and rollers – Improper tension can cause noise, vibration and the risk of belt or chain jumping.
- Contaminants in the system – Deposits and dirt can accelerate mechanical wear of timing components. If you need replacement, choose used car parts, which ensure durability and reliability.
How to choose the right chains, timing belts and mounting kits?
- Matching your vehicle model – At Global Parts you will find timing system parts that perfectly fit BMW , Audi , Mercedes , Volkswagen , Mini and more .
- Technical condition – Used belts, chains and tensioners should be free from excessive wear, cracks and mechanical damage.
- Construction material – Choose components made of high-quality materials that are resistant to friction, temperature and dynamic loads.
- Engine System Compatibility – Make sure the kit you choose is compatible with your drive unit design and specifications. Car parts, such as timing belts and chains, must be precisely matched to ensure engine safety and efficiency.
How to take care of the timing system?
- Regular replacement – Follow the service intervals recommended by your vehicle manufacturer to avoid serious breakdowns.
- Checking the tension of belts and chains – Regularly checking the tension and condition of the tensioners and rollers helps to avoid timing skips.
- Protection against contamination – Use high-quality oils and filters that reduce dirt build-up on timing system components.
- Repair or replace on time - In case of wear and tear or damage, choose car parts, which will ensure long-term efficiency and safety of vehicle use.
Summary: Chains, timing belts and installation kits at Global Parts automotive store
Chains, timing belts and assembly kits are key elements that affect the durability and efficiency of the drive unit. By taking care of their technical condition, you can avoid costly breakdowns and increase the engine's service life. 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/vehicle with us, and in case of any questions or doubts related to the selection of the right components, we will be 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 .