My wife says the X5 is running rough, sounds bad. I go out and it's the sound of hydraulic lifters not pumped up.

The computer says it can't read the oil level.

No warning light for low oil at all!!!!

(Oh, but it does tell me I have a rear stop light out!)

I dump in a quart of oil (20-50 Castrol synthetic I use in my Porsche 928).

Still can't read the level.

I go to the Mobil station and buy a couple quarts of 5-30 M1.

Dump one in and the computer says the level is now normal.

I swear I have a knocking rod now.

Engine light is on. And engine running rough off idle. Surely have some sensor malfunction.

Hasen't used a drop of oil in 4 years!!!

Just had it fully serviced in July.

Oh well.