Hi there

I'm after some semi urgent advice please (evening before long holiday / family drive. I have just lifted the back seat to vacuum. Under the fabric/felt under the seat there is quite a lot of oil / diesel. It hasn't gone through the felt. There appears to be some sort of sump under there (to drain the tank?) which might be leaking.

Car is a 140ps 2lt b6 estate.

Any idea what it is or whether I need to take immediate action?

Many thanks for any advice.

Cheers
KP