Taking along a mate who knows about cars, or at least claims to down the pub, is the age-old favourite.

Said mate may, or may not, know much about cars, but it's a second set of eyes to spot a dodgy car or seller.

Trust instincts and if your best mate says walk away, heed their advice and look at the next car on your list.

Major downside is buying a car on a mate's say-so will not only strand you with a lemon, but your friendship could turn just as sour.