Originally Posted by Peter J
On Friday the radiator level warning light came on when I started the car. After a few minutes it went out.
Today I checked the level in the header tank, sure enough it was at, or below, the lower level mark.
I had a bottle of BMW Antifreeze, so topped the system up.

I'll keep a close eye on this as the BMW N62B48 motor has a "known weakness" in that a coolant transfer pipe that runs in the "V" of the engine under the inlet system can start to leak from the "O" rings that seal the pipe to the cylinder block: there are lots of posts about this on US BMW forums. Water dribbles down on to the garage floor.

Repair is very costly in time....if the official BMW procedure is used as it requires a partial engine strip down, removing all the front end including cam chains: 2 days labour.... !!
A number of aftermarket solutions exist that are based on cutting out the pipe and fitting a new one that is in 2 parts.
Here is one..
https://www.pelicanparts.com/techar..._8_Cylinder_Coolant_Pipe_Replacement.htm
And here is a post from a UK BMW Specialist...
http://www.munichpower.co.uk/bmw-and-mini-blog/n62-water-transfer-pipe-failure/

In the meantime I'll buy a new bottle of antifreeze...and watch the garage floor....!

It looks like the 'telescopic' replacement pipe introduces more O rings & will these later fail ?

I would think Simon at SiFab will have come across this issue before, may be worth a chat, Peter ?

Jon M