My garage is level.
What stumps me is the fluctuating oil level. The car wasn't moved for the last week. So about 5-6 days ago I checked the oil level, and it was low. Checked it the next day - it was low like the previous day. Yesterday I topped up the e39. This morning I checked the oil level of the e39, and told myself: what the heck: let's check the X5 oil level again, and top it up. It was above the max level!!!.
And yes, when I check the oil level, the car is sitting for a while, so the oil has time to flow back in the sump. Why is that oil level changing so drastically after a few days - and this time the car wasn't even moved between these 3 oil level checks. Twice it showed low oil level, and this morning a smidge above the max level!!!!! It's insane!!!! This same behavior of fluctuating oil level is since I purchased this car (used). I don't know what to think, and I am not sure how much oil there actually is in the sump..... I wish I had that electronic oil level "dipstick" like the e9x.... This problem does NOT occur in the e39 or in the e46, or any other car I owned over the years.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.