My 07 AMV8 had an oil leak that was fixed under warranty. The best and cheapest way to bump the power up to 400 HP is to change out the cats and exhaust (saves weight too). First change the cats to higher flow ones as that might be enough for you though. I drive my car almost daily and it's been reliable.

 

I see that there is more oil leaks, if I say ASTON MARTIN OIL LEAK equal, we will have to change the symbol, to AM OL.

Indeed, some of you had a second oil leak ...