Hi Alyaparis,
Perhaps I can add some information which may be of use.
Regarding 2.8 R6, there was a known problem on models until late '98 in some areas of Europe where petrol has a higher sulphur content, leading to destruction of the engine block. Likely that this would already have occurred and been replaced under warranty if yours has 135,000 Km. Have not heard much of this problem in Germany but it was a major problem in northern England for example. I have a '99 728i with 143K, bought with 111K and only problem I've had was a failed radiator water thermostat. Luckily it jammed open and not closed!
Agree with all that's been said about Europlus although I don't have it myself - go for it.
Regarding 728i vs. 740i, depends how fast you want to accelerate as performance is very subjective. Personally, I found the 728 auto needed to work hard to keep the car moving fast with lots of auto-shifting up and down the gears, although cruising was fine. Therefore I chose a 728 manual and I find it acceptably fast and very economical (9.4l/100 average). Some folk insist a 7-series must have auto. Personally I don't mind changing gears the old way, especially as I drive through quite a bit of snow & ice in winter. But if you want an auto, 740 could be the way to go. Performance is very relaxed and gives the impression of being in a completely different league to the 728 manual or auto. Guess the downside is much higher fuel consumption if you use the performance.
Navigation - I'd definitely go for the standard BMW Navi if you can get it. Navi is also a great help when you re-sell you car as it's a very popular option.
Good luck!
Charlie
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