Appoligies for just jumping it with out introducing myself, but I have a problem that put a real downer on my weekend.
MOT ran out Thursday, been having lots of trouble including lossing water to which no solution could be found for a while, I had to use the car for work, so in that time I filled the Header tank up, my work is 12 miles away I never alowed it to over heat, and it never over heated, temp never got above 85 degrees, never seemed to lose more than less than half a litre of water ie coolent warning normally only just came on just as I got to work
problem was traced to the what was though was the three way valve at the back of the lump, thank fully my Stepson is a great little mechanic, and has regular battles with this car and as he replaced the valve I noticed it was still dripping and so the pipe was replaced, as well, this was about two weeks ago now so I know the water was pretty clean then, and no signs of oil. never had another water warning come up
Today I open up the header tank after a trip to halford for antifreeze for the wifes car and mine. I removed the header cap to find it quite empty, so I thought, I'd just fill it up with antifreeze, run the engine for a while then drain it a little and top it up some more.
On adding the antifreeze streight in to the tank, I was not greeted with water over flowing but to my horror a brown coffee like substance thick and cream like with a smell of oil to it. I flushed what I could out but it still there. I know it doesn't take a lot of oil to do this (ie a little oil makes a lot of mayo) but there seems to be an awful lot for a head gasket leak, and I'm hoping and praying it's not that!!!!
Some history on the car, it's now done 139K (chassis) engine was a vaxuhall replacement unit when the last one dropped a con rod at 71k she had a cam belt change 1 year ago, just after 65K on the new unit, and she is LPG converted (an must on these, save a fortune in petrol, and runs like a dream on it) I have no signs of mayo at all on the oil filler cap, and the oil looks okay (but I think that need changing and it was going to get one of those soon anyway!
To add to my woes, my steering lock has stuck on today! ARGH, so I've now got to free that before I can even move or start the car, thankfully at least I got antifreeze in and run it round before tonights big freeze (if it happens) before it stuck on!
Any idea, Oil cooler

or Head Gasket

As you can imaging I've had a bag on all day thinking I was going to have to scrap this as I know the gaskets are a bit beyond my boy, but I love my Omega and don't want to give it up with out a fight.
Lastly I understand the Oil cooler sits between the cylinder, thes being the case, I still have the old engine in the garage (yep the one that dropped a rod, so would you risk fitting that cooler over buying a new one if it is the cooler that seem to be at fault, money's a bit tight for all, me included, but if it is 80% or better % chance of it being the cooler, i'll give it a go, but is it worth the £100 over using an old spare I may have.
How can you tell the cooler has failed upon examination?
Thank in advance for any help.
Dave