They should be pre-oiled. I know that mine were from the blue stuff all over the plastic bags they were shipped in. You should be able to throw em in and be good to go!
Depending on driving conditions, you should take a peek at them every third oil change and count on cleaning them at about 12K mi for best performance (HP). You can service them with a K&N cleaner and oil kit, available mail order and at most auto parts chains (Pep Boys) for about $10-12.
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