One of them seems to have a problem with consuming oil. I serviced it about 3 months ago with the correct grade and high quality oil. I checked it over today to find the oil level now lower than minimum and the oil filler neck covered in cream mayo like condentation build up. The car does do a few short runs but also a good few long distance runs at 'high' speed too. In the last week it has done at least two 60 mile trips, so it shouldn't have chance to build up condensation as most town cars do.
I checked the coolent which is down only a little bit but there was pressure behind the cap despite the car having been parked for over 6 hours.
The other Clio has more miles on it but has not used a drop of oil in the same time the blue one has used 2 litres. There is no condensation mayo build up on the other one either, just the one which is consuming oil. The engine sounds a little tappety and its no doubt been neglected, service wise, in the past. It only has 73K miles
An obvious headgasket issue??

Just wondering what to advise its owner to do.
I was thinking ill do another service and use some wonderful Forte products to see if that'll improve things.