Have two different sets of feeler gauges that I bought almost a year ago, and both of them are starting to rust. One set is NAPA service tools brand, and the other is OEM brand. I keep them stored in a drawer inside the house to keep them out of elements much as possible. They have a light coating of oil, but that does not stop the rust. Do I have to keep these dang gauges submerged in oil to stop the rusting? I know they don't cost an arm and leg to buy, but is there any sets out there that don't rust, or can stand the test of time better than what I have now? I need metric and SAE, and I don't like gauges that skip because that's the one I usually need.