Timing chain rattle on start up sometimes (new timing chains)

[M62 X5]

I have a 2001 X5 with the M62b44 with 137k miles on it. Ever since I bought it at 129k miles sometimes it would rattle on startup for 2-3 seconds then go away and run normally. I tried replacing just the timing chain tensioner but the problem persisted and since I had no record of the chains being done I did them myself with all genuine or OE parts. Replaced the chains, tensioners, and all guides. No sign of any carnage on the old guides they seemed to have held up well but I was glad I did it anyway for piece of mind.

Now since the timing chain job, I still notice some rattling on startup. This seems to be random but mostly after the car has sat for 24 hours or more. Since the chains and guides are all new I started wondering if it could be an oil pressure issue. I started it up today and noticed that when the chains do rattle for 3-4 seconds the oil light takes slightly longer to shut off. When it starts up and doesn't rattle the oil light shuts off immediately when it fires up.

Things I have replaced already:

1. Full timing chain job
2. Oil filter housing with check valve
3. Oil filter housing O-rings between the adapter plate and the block

One thing that I'm wondering is if maybe the oil pump pickup O ring is leaking internally and making the oil pump suck air for a second or two on startup. Can this pickup tube be accessed by removing just the lower oil pan? I really don't want to pull the upper oil pan since it requires so much to get to it.

Part 4 on this diagram is what I'm referring to. Any other ideas?

[EODguy]

Vanos rattle, perfectly normal but you can clean your Vanos and see if it helps.

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[Henn28]

I get the same thing on my 4.6 with 10k ish on it. Not very often, and usually after it has sat for several days or more. My working hypothesis is that occasionally and briefly is ok, while always is likely not.

[M62 X5]

Originally Posted by EODguy

Vanos rattle, perfectly normal but you can clean your Vanos and see if it helps.

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Do you have a sound clip of VANOS rattle on the M62? I wasn't sure but it sounds a lot like timing chain rattle to me

[EODguy]

Originally Posted by M62 X5

Do you have a sound clip of VANOS rattle on the M62? I wasn't sure but it sounds a lot like timing chain rattle to me

https://youtu.be/O-IMEGHOqnM?si=_Ld1rfmgEeJbLCWx

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[M62 X5]

So I do have that VANOS sounds and I wouldn't be surprised if my VANOS needs done but that's not the sound I am talking about. The rattle on start-up sounds like a timing chain rattle.
This video is more of the sound I am getting. Combined with the oil pressure light staying on a little longer than it should makes me think it could be an oil pressure issue.

[x5Alpine]

I replaced the oil filter housing and it completely fixed the startup rattle. The check valves at the bottom of the housing go bad.

[M62 X5]

Originally Posted by x5Alpine

I replaced the oil filter housing and it completely fixed the startup rattle. The check valves at the bottom of the housing go bad.

That's in the list of stuff I already replaced

[M62 X5]

I think the only logical explanation is it's the drain back valves in the VANOS. I probably should have done the VANOS when I did the timing but I was on a time crunch. Since it's just the VANOS I'll probably just let it be at least until next summer since I rely on it as my only winter vehicle

[X5chemist]

Does anyone use additives? Lucas or Moly? My X5 runs Moly additive. Mostly because it can be brutal summers around here. I like the extra lubrication for periods of nonuse.