Oh, and I'd stick some steel seal in it. Unlike K Seal which is largely useless, it really does work. Two examples of cars recently fixed this way:
2002 520i, ran on three cylinders and pushing coolant out of the header tank. Pour this stuff down the top hose, reconnect it all, run on fast idle and one by one, the missing cylinders sprang back to life. After 15 mins it was running on six and it still does after 7 months.
2003 316i, ran on all four but pushing coolant out and fan cutting in all the time. This stuff worked within 10 minutes and it's fine now.
Not a permanent solution, but its' a 500 quid Nissan not a Veyron. No, it doesn't clog up the heater matrix.
Autoshite. It's like Pistonheads...but without the wankers.
MASTER RACE MOTORS.
1989 F 730i. Prestigious.
1999 S E36 318i Touring. Daily shitter.
1994 M 318Ti - Track whore