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My first guess would be paint in combination with shelter from the elements... As some pointed out, petroleum applications can be effective in the short term, but wash out quickly.. and you don't want to over do it... Incedental oil dropped into the environment is just that incedental.. unintentional drips, or even non-significant leaks. The environment has a fudge factor to handle a certain amount of point and non-pont source contaminations... mainly the dilution factor... Continual intentional application of fuel oils and such will eentually cause an environmental problem though...Keep in mind that a tablespoon of fuel oil can contaminate up to 2000 gallons of potable water. Also keep in mind that the EPA classifies waste oil products as 'hazardous'... Not preaching at you, just making a bit of a point... there are much better and environmentally friendly treatments for old iron, and especially wood. Liquid asphalt emulsion paints cure to an environmentally inert level and are excelent wood protectors.
Only reason I climbed on the soapbox is that as a CE I usually get to see first hand what pollution ( in general.. not just petro-chemical ) does to the environment. ... ok.. off soap box.. return to normal programming.. Soundguy
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