If you're tired to grind for credits in Gran Turismo 6, and you really don't care for spending real money with the game's controversial microtransactions, a way to make some quick cash has been discovered, but we don't know how long it'll last before it'll be patched out, so you better hurry.

First of all, make sure you have the 1.01 patch for the game, then purchase the Mercedes-Benz AMG Vision Gran Turismo, save your game and quit (IMPORTANT: Make sure the Mercedes-Benz AMG Vision Gran Turismo isn't selected as your active car when you save and quit).

In the Game data menu of your PS3 delete the 1.01 patch of Gran Turismo 6, then launch the game again, but refuse to download the patch when asked.

Open your garage and find the "[2055]" entry. That's your Mercedes-Benz AMG Vision Gran Turismo that can't be recognized without the patch. Sell it. For some reason you'll be told you're getting over 300 million credits, but you'll actually get only 20,000,000, with a net gain of 19 million, since the car costed one million to purchase.

Now you can save your game, reboot it and download the patch to play. Unfortunately the glitch can be used only once.

The 19 million you'll earn is the equivalent of $140 in microtransactions and it's enough to buy almost any car in the game. Not too bad for two minutes of work.

(Thanks for the tip: Johan)