Mineral oil is usually taken as a laxative. It is a clear,
highly-refined oil, aka sewing machine oil.

Chuck

PeterKeating wrote:
Thank's guys I suppose that means engine oil, or is it a thinner oil that
you use. Peter
"PeterKeating" wrote in message
...

Anyone Know what liquid goes in the receptacle of a thro' hull transducer,
I
have been told Glycerine but not sure. Thank's. Peter