Opel Z12XEP

Opel Z12XEPThe Opel Z12XEP is a 1.2 l (1,229 cc, 75.0 cu-in) straight-four 4-stroke natural aspirated gasoline small-displacement engine from the second generation of the GM Family O Ecotec engines, developed by Opel, at the time a subsidiary of General Motors. The engine was manufactured since 2002.

The Opel Z12XEP engine uses a light-weight cast-iron engine block with a cast-iron crankshaft and aluminum head with dual chain-driven overhead camshafts (DOHC) and four valves per cylinder (16 valves in total). It is an updated version of the Z12XE engine and features TwinPort technology – twin intake ports with a choke closing one of the ports at low RPM, providing strong air swirl pattern for higher torque levels and better fuel economy. The crankshaft and oil galleries were also redesigned. The engine used ECU Bosch ME7.6.1 or Bosch ME7.6.2.

It has a 73.4 mm (2.89 in) cylinder bore and 72.6 mm (2.86 in) piston stroke. Compression ratio rating is 10.5:1. The Z12XEP engine produces 80 PS (59 kW; 79 HP) at 5,600 rpm of maximum horsepower and 110 Nm (11.2 kg·m; 81.2 ft·lb) at 4,000 rpm of peak torque.

The breakdown of the engine code is as follows:

  • Z – Euro 4 engine
  • 12 – 1.2 Liter displacement
  • X – Comression ratio from 10 to 11.5:1
  • E – Multi Point Fuel Injection system
  • P – Increased power

General information

Engine Specifications
Engine codeOpel Z12XEP
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Displacement1.2 L, 1,229 cm3 (75.0 cu in)
Fuel systemMultipoint fuel injection (MFI)
Power adderNone
Power output80 PS (59 kW; 79 HP) at 5,600 rpm
Torque output110 Nm (11.2 kg·m; 81.2 ft·lb) at 4,000 rpm
Firing order1-3-4-2
Dimensions (L x W x H):

Cylinder block

The engine used a cast-iron cylinder block and a cast-iron crankshaft five-bearings supported system. Bore and stroke are 73.4 mm (2.89 in) and 72.6 mm (2.86 in). Compression ratio rating is 10.5:1.

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:10.5:1
Cylinder bore:73.4 mm (2.89 in)
Piston stroke:72.6 mm (2.86 in)
Number of piston rings (compression / oil):2 / 1

Cylinder head

The cylinder head is made of an aluminum alloy. The Z12XEP engine has chain-driven dual overhead camshafts with TwinPort technology. Valves are actuated via roller finger followers with hydraulic tappets.

Cylinder head
Cylinder head alloy:Aluminium
Valve Arrangement:DOHC, chain-driven
Valves:16 (4 valves per cylinder)
Valve timing:INTAKE
Valve head diameter:INTAKE27.90-28.10 mm (1.0984-1.1062 in)
EXHAUST24.90-25.10 mm (0.9803-0.9880 in)

Head tightening procedure and torque specs:

  • Step 1: 25 Nm (2.5 kg·m, 18.4 ft·lb)
  • Step 2: Turn all bolts 60°
  • Step 3: Turn all bolts 60°
  • Step 4: Turn all bolts 60°

Maintenance data

Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil 5W-30, 5W-40, 10W-30, 10W-40
Oil type API SG / CD
CCMC G4 / G5
Engine oil capacity (Refill capacity) With filter change 3.5 l
Oil change interval, km (miles)30,000 (18,000)
Ignition system
Spark plugBosch FQR8LEU2
Spark plug gap0.85-0.95 mm (0.0334-0.0374 in)
Spark plug tightening torque25 Nm (2.55 kg·m; 18.45 ft·lb)

Vehicle applications

ModelYears Produced
Opel / Vauxhall Agila A 1.2 16v2004-2007
Opel / Vauxhall Corsa C 1.2 16v2004-2006
Opel / Vauxhall Corsa D 1.2 16v2006-2014
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

1 Comment

  1. After adjusting the engine model z12xep we are having an ACCELERATION problem. Can you please advise. Thank you.

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