Ok. I will wait for your tests, then. I bought it from a big shop (TME.eu) and I don’t think they sell fakes. Here
is the datasheet for the mosfet I used. Thank you!
Later edit: I will try the scheme on bench, in house, using other type of transistors, like IRF5210PBF or IRF6218PBF and see how it goes. I'll simulate with a regular H11 fog light bulb found on my car and see how it goes with the heat. I'll post updates once I have it.
Later edit 2:
I tested at home and that mosfet simply does not handle the drain and gets very hot. I ordered now 2 x IRF6218PBF -150V; -27A; 250W; TO220AB
and 2 x IRF5210PBF - 100V; -40A; 200W; TO220AB
to test with and see how it handles the drain.
Later edit 3:
I received the mosftes today and I wired the IRF5210 one and it handles the current much better than IRF6215. Drain still gets hot, but not that much and not that quick as the one that burned. I let it run for 10 minutes to see what happens and so far, so good. Drain wire does not get hot, only the drain part of the mosfet. The black top part of the mosfet stays ok, but the drain side with the screw hole gets hot enough that you can’t hold your hand on it for more than 5 seconds. Still, it doesn’t start burning and that’s good. Maybe there’s a mosfet out there I can use that doesn’t get this hot, just to be future proof nothing bad will happen while installed on the car.