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My 2000 has started blowing blue smoke after sitting for awhile. Especially overnight. I am told that this is probably valve seals. Could it be anything else? Could anyone give me an estimate as to the cost to replace these seals? I was told to also ask if they could be replaced without removing the head/cam(?)? Any help will be appreciated.
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Bad valve stems seals usual result in a cloud of white smoke at first starts up. Are you sure it is oil and not unburned excess gasoline (smell the fumes)? The cams need to be removed to replace the seals, but a decent mechanic can do the job with the head still on the engine. One other possibility is engine blow by, does the blue oil smoke continue when you step on the gas? Or could be worn valve guides that require removing the head to replace. Also read the posts listed at the bottom of this page for other comments.
 
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