I've heard of people running ATF because it has the same viscosity as 10W30 and has ALOT of detergents in it. Then they drain it after like 300 or so miles and fill it with regular oil. I've heard that it can cure sticky lifters and clean out the sledge in the engine rather quickly (why you only want to drive for a limited number of miles, it'll clog the filter). I tried it on my '83 zephyr when i had it for a little while and all i noticed was that it had pink "oil", didn't seem to do anything. I've heard all sorts of odd stories, but i'll just stick to regular and scheduled oil changes.
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'84 Mustang 5.0 LX
My car