Help needed please! Dark spots under my car

[javi1892]

Hi there!
First of all I want to say hello everybody. I have been reading this forum without posting for long and now it is time to do so.
I own a TVR Cerbera 4.5 1999 since last month and I have noticed that sometimes, when starting from cold it leaves two parallel rows of small (1 in or so) black spots (carbon like) in the road. I am not sure of the origin of the spots as they only appear when running very slow just after startup.
Any ideas?
Yesterday we went for a long run (250 miles) and today the spots seemed darker.
Thanks.

[hut49]

Condensation (or a dog with a full bladder and a sense of humour) in the exhaust being blown out and washing out carbon build up?

[gazzab]

How much oil does it get through?

[gbbird]

I understand that a faint oil trickle at times is not uncommon or anything to worry about, due to the thinness of the oil these things use. But, would still recommend having it checked if it gets any worse

[javi1892]

The oil consumption remains normal. I have covered around 900 miles and I have filled with about 1/2 l or so.