i made a version of ed's oil that works great. it's 50/50 ATF dexron3 and kerosene k-1, with 250g of lanolin hydrous added per 2 litres of gun oil mix. lanolin is easily melted in a double boiler first then simply poured into the mix. give it a stir and it's done. will prevent rust on a stored arm for 2 years plus.