I think I might know the answer to this question already, but am hoping that someone can prove me wrong.

 

The history:

Octavia Scout TDi 2015

128000 miles

Has had the sticky water pump in the past.  This was replaced within a week of me first seeing the coolant temperature rising

 

The symptoms:

Using coolant

Using oil

Milky oil under the filler cap

DPF regen seems to be happening more frequently

No smoke/steam from the exhaust, but could the DPF be taking this out?

 

It all points towards CHG to me but could there be any other explanation.

 

If it is as I suspect, does anyone know how much this is likely to cost to fix and whether it's going to be worth the hassle?

 

Apart from this the car is a good one - dealing with all I throw at it (fully loaded along muddy farm tracks) so would like to keep it going if possible.

 

Thanks for any advice

It does have classic head gasket symptoms, but there is quite a bit to the cooling systems on those engines. There’s an oil cooler where failure could cause coolant and oil to mix. I think it’s integrated into the oil filter housing.

Edited 26 October, 20196 yr by classic

There's a test they do for detecting exhaust gases in the coolant isn't there. 

^^^ This, and a compression test as well. These engines are also known for 'head lift' under high loads. 

Thanks all,

 

The garage (Independent VAG specialists) are suspicious of the oil cooler as Classic suggested.

 

Will be going in next week when I'm back from holiday.