engine oil

Question

Hello

We are going to build nest boxes (recycle works) at school and we would like to know if it's possible to use 
only mineral oil (without other materials like linseed oil) to deal nest  them and if it's possible to deal with engine oil used (from cars) to nest birds and to nest insects.  We prefer using only used material.

Neither of us is sure about if it's good to paint the nest.

Thanks,

Alf
.

Bishy-barney-bee · Accepted Answer

Hi Alfredo, I'm not sure what is best to use on nest boxes but, I wouldn't use engine oil, lots of nasties in that and not good for the birds feathers. I would stay away from using any oils unless you have it on good authority because of the harm that may be caused to the birds plumage if you go to your local garden centre they do sell animal safe wood stains, just make sure they are safe for the birds, personaly I would try and find something totally natural, we don't use any chemicals whatsoever in our house, some of the others will be able to give you some pointers. 
 Linseed oil is O.K just found this link. 
 http://www.bbc.co.uk/breathingplaces/nest_box/