I cannot stress how highly enough it is essential for you to use an escrow service.
The OP is advertising to sell a 250K$ car on his first post here.

Can nobody else see this is ridiculously a blatant attempt at scamming?

I wouldn't trust an escrow with 50K$ let alone 250K! Despite their 'trust' from previous transactions they can easily keep your money and live on it for decades!