My 2003 X5 4.4 152k mi looks like it needs valve stem seals. Rough idle, misses on cold start, and occasional puffs white smoke on start when cold. Much better in warm weather. From another post where I asked around, likely valve stem seals which seem to be a common problem on the N62.

I have seen a few tools on ebay to do the job with the engine in place. The left bank #2 is pretty close to the firewall on the X5 so not much room which has me concerned about doing this without pulling the engine (which I am not going to do ).

Anyone have any experience using either the AGA N62 Seal Master's Tool Kit or these other tools advertised on ebay? One is available for about $380. The other kit from AGA is about $1000 or can be rented for two week period.

Neither requires the camshafts to be removed, but there doesn't seem to be much room to work near the firewall.

Thought to see what the experiences are before plunging in on this.