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Hi everyone, I'm new to this forum but thought I would share a problem and solution I had with my 2000 IS200. I bought my IS about 6 months ago when it had 143,000 on it. Ever since I first bought it, about 2 out of 3 times I started the car when it had been sitting for an hour or more (like overnight), it's blown a puff of blue smoke. I presumed it was the valve stem seals and so bought some to put in at some future time. I did clean the PCV valve though and even tried a new one but it didn't make much difference. I replaced the spark plugs a couple of months ago and noticed quite a bit of oil in the spark plug tubes. Also, I saw that the rocker cover was leaking a bit, so I bought a gasket set for it a few weeks ago. I replaced the cover gasket as well as the spark plug tube seals inside the cover the other day. And lo and behold, it's fixed the smoke on start up problem. The plug tube seals had gone real hard (like bakelite) and so it obviously was affecting the PCV system. Anyway, hope this helps someone else with an IS200. Evert