I actually never replaced my Valve Stem Seals. I replaced every piece of rubber that connects to the valve covers (There's a lot). Issue is almost completely fixed. Every once and a while after sitting for a very long time I'll let off a very small puff of smoke and I still have that slight oil smell to the exhaust but it's no where near the issue I used to have. I think one day I'll replace the valve stem seals just cause but for now it's very liveable

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2004 E53 4.4L N62