infinite money glitch
step 1 : buy the AMG VGT as many as you can but DO NOT select it , if u do the game will crash when you go back to 1.00
step 2 : quit game and delete the gt6 patches ( don't delete your save file )
step 3 : disable network
step 4 : run the game and start selling !
NOTE : you only get 20m max for every car you sell so try buying cars till you get back to zero and then sell another AMG

step 5 : once you buy what you want save the game and update the game and you will still have all the cars

have fun
What I did was delete the game update, sold the Vision GT, got the 20m went back and update the game, brought 20 vision GT and delete the game update again.
Even the car sold is for 330 million, but the max amount of money you can get is 20m. So you gotta spend it all before selling a second one. if you ran out of Vision GT, just sell the last one and keep the 20m and update the game to buy another 20.
Garage limit is 250, and stockyard is glitchy at the moment, there is a chance of losing your stockyard cars.