I need help for a lab report, thanks.
Because many materials/minerals are not a bit magnetic. Some materials may be repelled by a magnatic field, but that may not help much.
i would not try any of those sealers, via what you have suggested the slightly milkish could be slightly moisture in the oil, as for the water point each and every so often the water point unearths its very own sort of point, fill the water as much as max returned use for an afternoon or 2 if water has dropped purely below complete difficulty solved. purely save checking daily if dropped decrease then get a storage to tension try the water gadget
I agree with Tomcotexas. if you buy it get a good manual and keep in mind it has whitworth hardware. odd threads and bolt sizes. at least not common in usa
re torque the heads but buy new head bolts first