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We charge about 7-7.5 to do the cam tensioner seals. This involves removing both valve covers (replacing the cover gaskets) loosening the cam tensioner, replacing the seals and cleaning up the contact surfaces, reinstalling, cleaning up oil on bottom and back of engine.
If they are actuall talking about the cam seals, it's not much more to do them since you just need to remove a couple more bolts to loosen the bearing caps on each end- I don't think I have ever seen one of the cam seals leak unless someone has been in there previously to loosen the bearing caps, and didn't get it aligned right again- I'm guessing they are talking about the tensioner seals.
I can't imagine running through enough oil in 3000 miles to set off the oil light, even with these seals leaking- they don't tend to "stream" oil.