I always have my eye open for a SHO replacement. Been eyeing 5 series for a few years. Do any of the used market newer series (late E early F series) have fatal flaws that are no go?
For the E39, the fatal flaw is the cooling system. On a stock E39 the stock cooling system can be difficult to maintain and cause overheating. Copy/paste from my extensive notes:
- Replace stock plastic water pump with metal water pump. (It's easy to replace, it's at the top-front of the I6 engine).
- Replace the thermostat in plastic housing (all one piece) with aftermarket thermostat with metal housing with bleeder valve, makes cooling system maintenance simple.
- Replace upper & lower radiator hoses with silicone hoses
- Auxillary fan dies - replace it
- Rear rubber subframe bushings. Go bad around 100K. "the rear subframe bushings require quite a lot of work to replace. It requires taking the entire rear suspension off and dropping the subframe."
- E39 diverter valve, pin comes off and ruins the engine. Rebuild it.
- Crankcase vent valve diaphragm breaks, engine runs lean and rough.
These are my notes on the fatal flaws and except for the subframe bushings all are easy to fix.
Other important but easy to fix issues is rebuild the VANOS variable valve timing unit, replace oil pan sensor & ignition switch. Electronic dash pixels go out. All easy to fix.
On a sport package equipped car the tires wear quickly, especially the rears. Expensive to maintain. Avoid sport package if you want reliability.
The most reliable year for the E39 is the last year, 2003. It's also the last year a BMW looked like a BMW.
The I6 530i is the best, 230hp, 220 lb-ft torque (sound familiar?). Expect 23mpg city and 28mpg highway.
The I6 525i is underpowered.
If you get the unreliable V8 540i you need to join BMW's Adopt-a-Mechanic program and expect to replace the transmission.
The E39 community has some of the same mutual support as the SHO, with a hint of arrogance thrown in and lacks some of our warmth.
This is the video handbook:
42 facinating minutes of very cool features. If the SHO is a Batmobile, the E39 is a James Bond car.