getty150, super nice collection! Are they all daily drivers?

The S54 sounds interesting. I had too google it to find information.

Effduration, you are correct. After two years of maintenance, the X5 is happy daily driving above 2000 RPMs. It likes highway speed. Long and short bursts of 70-90 MPH are nothing. I bet it could turn 2500-3200 RPMs all day. An oil pan gasket fix removed a lot of oil sludge build up. A proper thermostat runs at ~193 F. To help with cooling, I keep a stock mechanical fan running. I can hear it engage during warm up. Now if I could fix the oil burning issue, I would be super happy. It's not bad. I can see a small cloud when taking off from a dead stop.

__________________
'06 X5 3.0i - bought @143,123 miles (12/26/20)