Penetrating Oil is a low-viscosity oil that is useful to help free rusted parts, such as nuts on a bolt, to aid in removal. The name comes from the oil being able to penetrate into the narrow space between screw or bolt threads. You can purchase the commercial version at any hardware store, but you can make your own in a pinch if you have access to acetone and automatic transmission fluid made from dextron/mercron.
Instructables user points out that this DIY recipe worked better than the commercial product when having to remove a rusted brake rotor from an axle and was much less expensive as well. To make your own just mix up a 50/50 batch in a cheap spray bottle and shake that bottle quite well before using as the two liquids separate like oil and water. You probably already have acetone around the house (paint thinner or nail polish remover) but the automatic transmission fluid might have to be procured at a local auto parts store if you don't regularly maintain your vehicle.
Home-made pentrating oil | Instructables
Source: http://feeds.gawker.com/~r/lifehacker/full/~3/A6-1Fht9pa8/diy-penetrating-oil
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