engine oil and radiator damage. Fails too quickly!

[Kodoss]

The only way to hobble home over the channel is height!

You need 4 km altitude, throttle down to idle (to keep it turning), pitch to coarse and glide home.
But this also depends on the damage of the engine.

I don't know where I read it, but one Bf 109 pilot (from JG 5? ) had his engine shot behind enemy lines.
He feathered the prop and thanks to good thermal lift he glided 70 km back over the lines.