The 3.0-liter inline 6-cylinder Opel C30SE engine was produced from 1989 to 1993 and was installed on the top versions of the first generation Omega model and the similar Senator. There was a derated version of this motor for an automatic gearbox with the C30SEJ index.
Opel’s CIH (cam-in-head engine) powertrain line debuted back in 1965, and three years later straight-sixes appeared in the series. And in 1977, their volume reached 3.0 liters. The first engines of this family were equipped with a 12-valve cast-iron cylinder head and a carburetor, such as the 30H engine. But soon all versions switched to fuel injection: the 30NE engine had Jetronic, and the C30LE and C30NE power units had a more modern Motronic.
Finally, in 1989, the C30SE unit and its derated version for the C30SEJ automatic transmission appeared, which were distinguished by the presence of an aluminum 24-valve DOHC cylinder head with hydraulic compensators, as well as an intake manifold with a proprietary Dual Ram System geometry change system. Otherwise, there is a cast-iron cylinder block, a timing drive consisting of a large and small chain, a distributor ignition system and distributed fuel injection such as Bosch Motronic ML1.5.
C20/30 family: C20NE, C20XE, C20LET, C24NE, C30SE.
Specifications
| Production years | 1989-1993 |
| Displacement, cc | 2969 |
| Fuel system | distributed injection |
| Power output, hp | 204 |
| Torque output, Nm | 270 |
| Cylinder block | cast iron R6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 95 |
| Piston stroke, mm | 69.8 |
| Compression ratio | 10.0 |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Turbocharging | no |
| Recommended engine oil | 5W-30, 5W-40 |
| Engine oil capacity, liter | 5.5 |
| Fuel type | petrol |
| Euro standards | EURO 2 |
| Fuel consumption, L/100 km (for Opel Senator 1990) — city — highway — combined |
14.3 7.6 10.4 |
| Engine lifespan, km | ~400 000 |
| Weight, kg | 186 (235 with attachments) |
The engine was installed on:
- Opel Omega A (V87) in 1989 – 1993;
- Opel Senator B (V88) in 1987 – 1993.
Disadvantages of the C30SE engine
- This is a very reliable and resource unit, without any pronounced weaknesses, but its aluminum head does not like overheating and tuning: cracks immediately go through it from valve seats to candle wells.
- Gaskets and seals here are not famous for their resource and frequent overheating exacerbates the situation. So the appearance of oil in the candle wells hints at a breakdown of one of the gaskets. And if replacing them does not help, see the condition of the valve cover stud seals.
- In general, the timing chain here is quite reliable and many drive 300-400 thousand without problems, however, overly active drivers are often forced to change chains already by 100,000 km. Also in this motor, the shoe of the tensioner of the long timing chain is quickly erased.
- In specialized forums, they often complain about the ignition system and especially high-voltage wires, the engine speed constantly floats due to contamination of the fuel injectors, the idle speed controller or the mass air flow sensor, and the hydraulic lifters cannot tolerate low-quality oil and can knock even up to 100 thousand km.
Frequently asked questions about the Opel C30SE
How much power does the Opel C30SE make?
The Opel C30SE develops 204 hp and 270 Nm of torque.
How much oil does the Opel C30SE take and which one?
Engine oil capacity: 5.5 liters. Recommended oil: 5W-30, 5W-40.
Does the Opel C30SE have a timing belt or chain?
The Opel C30SE uses a timing chain.
Is the Opel C30SE turbocharged?
No, the Opel C30SE is naturally aspirated.
Does the Opel C30SE need valve clearance adjustment?
No, the Opel C30SE has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Opel C30SE last?
The typical lifespan of the Opel C30SE is ~400 000 km with proper maintenance.
What is the fuel consumption of the Opel C30SE?
Opel Senator 1990: city 14.3, highway 7.6, combined 10.4 L/100 km.
What cars was the Opel C30SE installed on?
Opel Omega A (V87) in 1989 - 1993; Opel Senator B (V88) in 1987 - 1993.
What are the common problems of the Opel C30SE?
This is a very reliable and resource unit, without any pronounced weaknesses, but its aluminum head does not like overheating and tuning: cracks immediately go through it from valve seats to candle wells. Gaskets and seals here are not famous for their resource and frequent overheating exacerbates the situation. So the appearance of oil in the candle wells hints at a breakdown of one of the gaskets. And if replacing them does not help, see the condition of the valve cover stud seals. All known problems.
