Couple things:
1. Car maintained at BMW does not mean it is in good shape. With engine oil changed every 15K miles, No. 1 enemy is "SLUDGE"!!!
Just go a Google Search Images for
"BMW Sludges":
- Open the Oil Filler Cap and look inisde for Sludges. If you see Sludges, then run away from the car. The M52, M54 motor has a "Baffle" (open the Engine Oil Filler Cap and you will see it) which may hide the problem. The Sludge may be hidden below the "Baffle". But the car being in TX may help b/c the weather down there is not that cold.
Sludge builds up when you deal with:
a. Short trips less than 3 miles
b. COLD weather (like the North with snow).
c. Long oil change intervals like 15K.
- Most of us here change our oil every 4-6K miles or so, give or take. We (the bimmerfest enthusiasts) don't believe in 15K oil interval,
even with Synthetic Oil.
2. Cooling System is No. 2 on the list, if car has not had any Cooling System work, then it needs a Cooling Overhaul soon.
3. Any other items can be addressed later; (
I will link you to all the DIYs if you passed the first 2 tests above!):
- Changinging Trans + Rear Diff Fluids
- CCV, ICV DIY
- Suspension Overhaul
etc. etc.