« Reply #9 on: January 19, 2013, 02:58:21 pm »
The expensive but best penetrating stuff I have found is Wurth Rostoff. This tends to be a trade product so you might need to get a chum with a garage to buy it. It is 10 times as good as things like WD40. It is more expensive and I keep it for special situations. Ultimate attack is a day or so of working Wurth in then into the vat of diesel for a few weeks. Most things move after that, though really noshed piston/barrels and such where there is electrolytic corrosion and/or damage are often to resistant to move without force.
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