Had the suspect sign of chocolate milkshake in the header tank so took my signum (3.2V6 manual) in to be diagnosed. As expected, the garage came back with a faulty oil cooler. (amazing how many go after 30,000 miles - mine has 32,000!)
Had a new cooler and seals fitted yesterday, which including a flush (using forte bio degreaser), new coolant & repalcement header tank. Drove home happily only to find that when I looked under the bonnet, the header tank was full of gunk again. Looked as though the garage did not change the header tank as it just full of brown stuff again.
Drove back to the garage who insisted they had changed the part (showed me old one) and the reason there is still the remnants of oil in the coolant is that there was always going to be oil stuck to the pipework and it will take a number of flushes to fully clean the system and this will be difficult to acheive.
I understand the logic behind the statement but wanted to check with anyone who has had the same problem that this is the case, or did your coolant stay clean after the garage replaced the oil cooler the first time round?
If they are correct, I am obviously going to try and flush it a few times myself rather than paying someone for the privilege. Any magic suggestions as the best things to try? I've heard stories about running the car for a few days with washing powder or diswasher tablet to clean the coolant system???? Is this for real????
Thanks in advance