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[Figureman52]

Since I changed the HBV in May the car has been suffering from a steady but small loss of coolant.

Up until now have been running on tap water pending sorting the coolant loss, tank has always been clear.

Decided today to do a pressure test, found the expansion tank full of oil/water mix.

Is this an oil cooler failure? Or could it be something else?

[amba]

Sounds pretty convincing oil cooler failure ,sorry to say

Quite a straight forward job to fix although you will need to ensure you fully flush all that oil sludge from the coolant system.Good guide in the maintenance section.

Also worth changing thermostat at same time as that will probably be gunged up too.

Dont buy second hand cooler imho .Follow guid and you will be fine 

[tunnie]

Classic oil cooler failure, don't drive it until it's been fixed 

[TheBoy]

How long have you been runnign without fresh antifreeze?

[kevinp58]

Oh yes oil cooler

[Figureman52]

How long have you been runnign without fresh antifreeze?

Since May

Changed HBV, forgot to buy antifreeze when I did the job. Bought it, noticed slight coolant loss, thought sort it before putting antifreeze in. Can't belive 4 months have elapsed.

Only covered about 1500 miles. Expansion tank totally clear  last week.

What's the best source for replacement cooler? GM genuine? If so what price am I looking at?

[Figureman52]

Can anyone tell me if these parts are available at trade club prices?

4 off - 11076852 - Oil pipe to cooler metal O ring
1 off - 93176626 - Oil cooler kit, includes, cooler, cooler plate, 2 nuts and 2 O ring seals
1 off - 93165267 - Grey coolant plate sealent (fits cartridge gun)
4 off - 12992647 - Coolant bridge dowty washers
Oil filter

Thanks

[JamesV6CDX]

Vauxhall parts warehouse / vaux world do kits at good rates with genuine bits

[Marks DTM Calib]

The running on tap water is what has caused your failure (antifreeze has anti corrosion additives).

Oil cooler kit can be got here:

http://www.ebay.co.uk/itm/VAUXHALL-OIL-COOLER-V6-OMEGA-SINTRA-SIGNUM-93176626-/190843297148?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2c6f259d7c#ht_909wt_907

Other items are Vx supply, you should get some trade discount and there not to pricey

[Figureman52]

Thanks for the information. 

[Field Marshal Dr. Opti]

Thanks for the information. 

Console yourself with the thought that the oil cooler usually only needs replacing once in the life of an Omega.

I had the same problem. All fixed now.

[Marks DTM Calib]

Or if correctly serviced, never in the life time of the car 

[kevinp58]

The running on tap water is what has caused your failure (antifreeze has anti corrosion additives).

Oil cooler kit can be got here:

http://www.ebay.co.uk/itm/VAUXHALL-OIL-COOLER-V6-OMEGA-SINTRA-SIGNUM-93176626-/190843297148?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2c6f259d7c#ht_909wt_907

Other items are Vx supply, you should get some trade discount and there not to pricey

I got mine from stealers, cooler, sealer and all the o-rings and washers for £170 including the VAT. 

[Figureman52]

Or if correctly serviced, never in the life time of the car 

Duly chastised.  ;

[Figureman52]

I've checked the guide but can't see the torque value for the E12 bolts around the oil cooler plate.

Could someone tell me what it is?

Thanks