Classified Ad scam for used car

I got this email from a scammer, in response to a classified ad for a car. You can see that his questions are more sophisticated than the others:However, the signs of scamming is there, such as "the item", and signing "Donald" while his name in the email is "greg mcdonald".

From: greg mcdonald <gregmcautos@yahoo.com>Subject: [title of car ad from craigslist]HELLO, MAY I KNOW IF THE ITEM YOU ADVERTISED ON THE NETIS STILL AVAILABLE FOR SALE, MY CUSTOMER IS INTERESTED INBUYING IT , HE IS PRICING IT $950 ,LET ME KNOW IF ITS STILL FORSALE, WITH THE BOTTOM PRICE .ASAP.WHEN WAS IT DRIVEN LAST?ARE YOU FIRST OWNER?Donald 

My reply:

Not first owner.Being driven every week.Please call 555-1212 for details.

He then replies:

Hello  Khalid,I will be travelling out toady on a vehicle inspection ,you can always be intouch with me easily through the mail,Happy to let you know that my client is still interested in your Item,He informed me that the Bank Money Order will be in the amount of $18,000 which covers the total cost of your Item ,sales tax,mvc costand shipping charges.Therefore once you confirm your payment ,you are required to deduct the cost of your Item and make advance available to my Clients Agent currently on vehicle pick up   ,to enable  them offset shipping cost ,make prompt booking with shipping company,pay haullage cost,insurance,taxes and process all documents (bill of sale,vehicle titles,etc)on his behalf make repairs on the Item if need be?confirm this and send your Name ,to make out the payment,Address for mailing of the check,phone No.Your Honesty Understanding and Co-operation will be appreciated .ThanksDonald

He still says "the item", and offers 18 X my asking price! what a deal!He asks for more, then will ask for the difference to be wired back to him, and that is the  scam.