Diesel additive leak on Clubman
The Honest John note was posted as a result of my wife's experience with her '08-reg. Clubman D.
We noticed exactly the same symptoms lloydml describes (at first, we thought it was sap from a tree she parks under sometimes!). Realized what was happening, took the car in and were quoted £900 for for repairs! The work has now been done, but we are in dispute with the dealer, so this story isn't finished yet!
The 1.6 Diesel engines used on the Clubmans up to 2010 are PSA/Ford/BMW collaborations. They are fitted with catalytic converters and Diesel Particle Filters (DPF) which, unlike BMW BMW Diesels (which use DPFs that don't required additive injection to assist their operation), are based on PSA's additive-assisted DPF system (whether or not the additive is Eolys, I don't know - BMW/MINI aren't saying). The additive is contained in a reservoir (which looks like a flat plastic bag) and injected into the main fuel tank by a pump, the whole reservoir/pump assembly being bolted to the underside of the main fuel tank as Malc6552UK describes. The trouble is, that the reservoir/pump assembly seems to be connected in a way that means that BMW dealers can't be bothered to separate the two and find out which component is actually leaking. As the Honest John note says, BMW dealers are completely unfamiliar with the MINI DPF system and some don't even know it exists - they just assume MINIs have the same system as 320Ds, 535Ds, etc.
In my wife's cars' case, we took the car in to have a fluid leak fixed, and the dealers' technicians decided they couldn't undo the single fastener holding the additive reservoir/pump assembly on to the underside of the main fuel tank, and so quoted us £900 to replace the additive reservoir/pump assembly - by replacing the entire main fuel tank! In lloydml's case, it looks as though his dealer did manage to get the nut/bolt undone, but still can't be bothered to try to separate the reservoir from the pump, so he gets away with only £460 - to replace what might well be just a failed 20p O-ring!!
N.B. To all - there's an awful lot of absolute rubbish being posted on the Internet about DPFs, and a lot of people making money in removing perfectly good DPFs on the back of all those scare stories. The MINI DPF system on my wife's car works fine - the tailpipe is absolutely clean, after 4 years and 24K miles use, and we've never had a problem with the system regenerating, or getting blocked, or any of the other stuff you can find on-line. This is just a case of a little fluid leak, quite possibly from a single failed O-ring/seal, which a BMW/MINI dealer cannot be bothered to repair properly.
BTW - MiniDeLux - you have a weird idea of where things are under the car if you think that "black/dark orange fluid leaking from just in front of the rear right wheel" could be coolant. Believe me, the coolant pump's a long way away from there, and so are the driveshafts (and since when did driveshafts leak fluid?)
As to whether it's common or not - who knows? That's what forums like this are for. My wife's car is one of the first Clubmans, and I think the Cooper Ds came out about the same time with the PSA 1.6 Diesel engine. Anyone else had strange fluid leaks from the back end of a 1.6 MINI Diesel?