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[Doctor Gollum]

Depends on the engine and its overall condition. My high mileage 3.2 used to use about half a litre every 10k miles, but VW think it is reasonable for a new engine to consume a litre every thousand kilometres.

The handbook doesn't specify an amount, but does say that some usage is normal and different journey and driving styles will affect the consumption

[fcc-pt]

I've to add 5/6 times that amount but then the engine has a LOT of leaks in particularly by the valve covers (suspecting that the breathing system needs maintenace) so I don't have any idea about the real consumption.

[Doctor Gollum]

Which amount? 2.5-3 litres between changes is alot, but not necessarily excessive... 5-6 litres every 1,000 kilometres is indicative of a much bigger problem

Most cars require some sort of ongoing preventative maintenance. Otherwise you end up where you are now. Most dead Omegas end up dead because successive owners keep ignoring the various issues.

[fcc-pt]

Which amount? 2.5-3 litres between changes is alot, but not necessarily excessive... 5-6 litres every 1,000 kilometres is indicative of a much bigger problem

Most cars require some sort of ongoing preventative maintenance. Otherwise you end up where you are now. Most dead Omegas end up dead because successive owners keep ignoring the various issues.

I'm sorry, I meant 5 or 6 times more = ~2,5 liters every 10000 Kilometres
If I discount the leaks that probably go up to 1 liter easly...

[fcc-pt]

Which amount? 2.5-3 litres between changes is alot, but not necessarily excessive... 5-6 litres every 1,000 kilometres is indicative of a much bigger problem

Most cars require some sort of ongoing preventative maintenance. Otherwise you end up where you are now. Most dead Omegas end up dead because successive owners keep ignoring the various issues.

Well, I've spent a lot of money on this car since I own it.
The problem are the mechanics that nowdays barely can change parts, it's a feeling of defeat... the last maintence costed me around 3000€!

[Doctor Gollum]

Not surprised if your defering everything. 

[fcc-pt]

I need original Head Gasket Kit GM/OPEL/VAUXHALL part numbers.
Decided I only go with GM/OEM parts.
If need engine details take a look at the first post please.

[sjc]

I need original Head Gasket Kit GM/OPEL/VAUXHALL part numbers.
Decided I only go with GM/OEM parts.
If need engine details take a look at the first post please.

Victor Reinz were the OEM supplier 

[Nick W]

I need original Head Gasket Kit GM/OPEL/VAUXHALL part numbers.
Decided I only go with GM/OEM parts.
If need engine details take a look at the first post please.

GM gaskets?


Have you won the lottery?


Even if you pay the full retail price for a Reinz or Elring set, the saving will be impressive. And I bet GM only list them separately, so you'll save time and grief ordering them too

[fcc-pt]

I need original Head Gasket Kit GM/OPEL/VAUXHALL part numbers.
Decided I only go with GM/OEM parts.
If need engine details take a look at the first post please.

GM gaskets?


Have you won the lottery?


Even if you pay the full retail price for a Reinz or Elring set, the saving will be impressive. And I bet GM only list them separately, so you'll save time and grief ordering them too

Nope 

How about these ones https://racingcustomparts.com/produkt/compression-rate-plate-opel-v6-series-x25xex30xez32se/

[Nick W]

I need original Head Gasket Kit GM/OPEL/VAUXHALL part numbers.
Decided I only go with GM/OEM parts.
If need engine details take a look at the first post please.

GM gaskets?


Have you won the lottery?


Even if you pay the full retail price for a Reinz or Elring set, the saving will be impressive. And I bet GM only list them separately, so you'll save time and grief ordering them too

Nope 

How about these ones https://racingcustomparts.com/produkt/compression-rate-plate-opel-v6-series-x25xex30xez32se/

Those are used with two normal head gaskets per side to lower the compression ratio for boost. Completely pointless on a normally aspirated engine. Anyone who is serious about building a high boost engine would design custom pistons to do the same job.


You want something like THIS or THIS


You'll need new head bolts too, for another £30.

[fcc-pt]

Unfortunately none fit my engine but the price tag is very decent

[Nick W]

Unfortunately none fit my engine but the price tag is very decent

They were just the first ones I came to. Prices from various suppliers seem to range from about £70 to £100. A 3.0l set will cost the same as a 2.5. Vectras use very different intake manifolds and plenums, which mean the upper gaskets differ. On the Omega, new head to inlet gaskets are usually all that's needed because the others are rubber seals that are probably reusable. Those sets do include the cam oil seals, which you will want to replace. Ensure you're fitting them for the correct rotation


The 3.2(and 2.6) sets tend to be a bit more expensive because the exhaust manifold gaskets cost more.


Fit a new thermostat while you have heads off. The housing and transfer tube can be removed as a unit once the cam belt backing plate is off, which increases your chances of reusing the tube.

[fcc-pt]

The thermostat is new I had it replaced a couple thousand km same with water pump bronze impeller and the timming belt kit as well.
It kills me to replace everything...
Will I need a straight edge of 400cm and a feeler gauge to check the heads for flatness expenssive tools...

[Nick W]

The thermostat is new I had it replaced a couple thousand km same with water pump bronze impeller and the timing belt kit as well.
It kills me to replace everything...
Will I need a straight edge of 400cm and a feeler gauge to check the heads for flatness expensive tools...

A good quality 300mm steel rule is more than good enough to check the heads. That's a £10 tool that you probably already have. Use it with a small torch. Any head that fails that test is then checked with the feeler gauge to determine whether you get your machine shop to check it with dedicated and precise tools/procedures.