I replaced 4 valve stem seals today (cylinder 1). Only 28 left! Lol

It took me about 2 hours using the AGA tool set, working slow and getting used to the process. I started with the leak down tester method to keep the valves suspended, but then I switched to the rope method (much easier in my opinion). It’s definitely tedious work, but I don’t think it’s particularly difficult. The thing that gave me the most trouble was getting the old seals off the valve stem. I have the hose pliers that everyone suggested getting, but I find myself wishing the tips were at a 90 degree bend angle instead of a 45. It’s hard to get the right angle and get a good grip on the intake valve seals.

My seals don’t look too bad, but they’re definitely hardened compared to the new ones and the inner diameter is bored out a little. I’m sure I would have started to see smoke in the next 10-20k miles.

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2006 X5 4.8is