"when oil and or coolant is leaking into the combustion section"
Is this what AH models? Or, is it a leak from the oil or coolant reservoir?
It seems likely that damage from a bullet which produced a leak into the combustion chamber would also produce <cough> additional damage, which would bring the engine to a halt in quick order. So, AH must be modeling a leak from the reservoir.
OTOH, a leak from the reservoir wouldn't tend to produce smoke. So, AH must be modeling a leak into the combustion chamber.
I'm flexible.