Here is some information so you will be able to tell if they are fake or legit-Google Nigerian 419 Scam and read the Wikipedia article. There is a special section on how they can scam you when replying to your car ad.

I got a call from (07) 3637 2846 re a car that I have for sale, are they genuine or are they a scam.

i received a call on this number concerning a car i have for sale, they rang me as BMA CAR BUYERS,
crn of holt street and curtin ave east Eagle Farm Brisbane QLD.

i received a call on this number concerning a car i have for sale, they rang me as BMA CAR BUYERS, crn of holt street and curtin ave east Eagle Farm Brisbane QLD.

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Took my hilux down there and they found some rural client for it, took about a week or so to get it all happening but once I dropped the car off i received payment the following day and was a fair price I thought.