I used to use motor oil until Raiyn (another member) got on me. At the time I though he was full of BS, but I tried some White Lighting and have not looked back.
I probably own him an apology (or a thank you) for saving me time from having cleaning my chain. It was hard to pay the five bucks for 6 ounces compared to 79 cents for a quart of oil, but bike lube seems to go further than motor oil.
ehenz