Yes it can as it is highly toxic.
oil and pollution
Yes, it can.
It all depends on the make of the engine, application, oil type and usage of the engine.
oil is used in engine to avoid the heat which can be created by the friction in engine parts oil lubricates engine from inside to avoid ressistance and to make it work smoothly
If you overfill the engine oil you can damage the engine. The crankshaft will make contact with the oil causing it to form a froth of oil and air which is a poor lubricant.
innit, who the coal does that kinda stuff?
Tea tree oil can make a cat or dog sick, if more than a small amount is consumed. They are not supposed to be fed tea tree oil. It is not healthy to them, even in tiny quantities.
Yes, It can really make them sick.
I doubt that very much.
No, but you need to make sure that whenever you decide to run that engine in a car you have oil in it.
yes. its been known to happen.
A cracked radiator will NOT put water in the engine and make the oil milky. A bad head gasket WILL put water in the engine and make the oil look milky. That does not neccessarily mean you have a bad engine. Have someone fix or replace the radiator and replace the head gasket. It could be a good engine for a long time yet