Possible scam on carsales

[S3SR]

I posted my XR8 for sale as im no longer able to support it financially

so anyways a few thousand views and 100 clicks on my ad and some guy asks "Is there anything else i should know that isnt in the ad?"

i didnt think anything of it, just answer No, thats it ,etc

they tell me they need my email address to pay via paypal (which i think is fine minus the fees and it would be awesome), etc, etc

i honestly dont care where the money comes from as long as its bankable

this morning i get an email saying "oh forget to tell you my agent sent me an email and said he wont come to pick it up unless he pays him his agent pickup commission of x amount "


- this part is fine, but im thinking its got nothing to do with me

- next part of the email is its a UK company and he is going to send me $2k more and if i can help him by western unioning it to them via the post office
(again Fine, im happy to still do this, but WHAT does it have to do with me)

so heres the info so far
communication is via email only, no phone calls
payment method is i guess all online, im taking the hold up waiting for something to clear, cheque or personal loan
the UK agent bit is what puts me off



the question is this

- lets play with these cards, what can i be stung for if i continue playing?
(beside paypal fees) can paypal payments be easily withdrawn after payment is made.... ie he pays me, i cash it out (takes half a year to do so) he takes it back making some story up??

- transferring via westernunion, as long as it can actually be done at a postoffice i dont care, but is there anything that can bite me on the bum?

- does anyone know if this is a scam........... and what is the outcome they are trying to achieve?

- do i need to change my email password?


thanks