Yup, one 20mm or 2-3 50cal pings usually cause fatal damage on 109s.
Also sometimes i get the feeling that doras and 152s are flying radiators : )
In the other hand, the spits radiator very rarely gets hit. True, i very rarely fly spitfires, maybe they lose the wing sooner than the radiator?
I would like to see planes with 2-rounded cooling system being able to run with reduced throttle. Or whatever the historical method was.
A bit off-topic, but...
oil damage. In my book, "The Italian Air War, from the liberation of Rome to the capitulation", there are plenty of memoirs about dogfights and chases. Many spitfire pilots chased down 109s in that time. The tipical story was the following: spit reaches some hits on the gustav, he runs away smoking, the spits chasing. And the engines werent like full power to an exact point then full jam, but they lost power continously. Ergo, many spit pilots said, the 109/410 could extend for a while, then they started to slow down and got caught.