They look good, used yes

Yes; these look fine to me.

We do not speak of things that are original & still working! :rofl: In all seriousness, no issues with the abs sensors, they are in fact original. Mostly the normal maintenance stuff.

Plug color for your application is NORMAL.

The only way to read plugs correctly is to do a drive cycle, kill the engine and pull the plugs. The tip and porcelain can be read as if you were reading snow fall. Just the top layer is the last run. If you would run Highway speeds for 1 hr and then pull the plugs, you would see a whiter ceramic and less "brown colors". Idling, short trips, colder weather, etc. All of this will create a colder running plug like you see in your pictures. All is NORMAL.

Replace them (Pick a brand you like), add a DOT of anti seize on the thread shell, check the gaps on the plugs before install (.032"), use a torque wrench set at 20-22LBS and ignore anyone who tells you differently as they have no experience in the plug world other than screwing them in and allowing someone else later on to pull them out, threads and all.

Tip: Change your plugs to the later technology fine wire single side strap as this will provide a better idle and tip in acceleration. Example NGK Iridium Xi plugs. Yes, there is a small improvement in fuel economy when compared to other multi-prong plug brands. No there is no horse power gains as all you are really doing is providing the engine power cycle with a clean longer burn time in mil secs. Yes, emissions gets better as a bonus if you are worried that your X5 is killing your local snail darter population or tree owls. ;)

Drive on

Colors in pictures are dependent on photo lighting, the software used to transfer it to a posting file and the device each of us use to view your pictures.

That said the engine could be lean. I think if the engine was running rich it would be apparent from the photos so I don't think the engine is running rich. If the colors of each one is the same that's good. If none of them show oil that's great.

Based on my monitor the air/fuel mixture is fine but if you are concerned I would show them to a local tech to read.

Just did the compression test. May have messed up. Does the engine have to be warm? Mine was 50's cold from last night. From 1-6 this was my reading: 120, 90, 100., 100, 120, 70,
ouch. How can this explain puurfect idle, smooth acceleration, mo major oil burning.
Weird. What did I do wrong?

I'm guessing that's PSI?

Did you have the throttle fully opened?

All these values seem low, should be > 140 if memory serves.

The engine should be warm so that the pistons are fully expanded and you get the best seal.

Yeah, I messed up. Not sure what you mean by throttle open? I had the fuel pump fuse out and just turned the key. Didn't pump the accelerator . NO the engine was 50's ish. from last nite. I think I just go with the toasty brown plugs.

Engine needs to be able to ingest air in order to compress it. Compression test is always done with a WOT (wide open throttle).

Throttle needs to be open.