I would say that you're probably exaggerating a little too much.
Like the best 4.6is in the country and the negations don't help at all but actually can annoy a potential buyer
"Never flush a ZF over 100k"
"Never use Mobil 1 in bmw's"

And sometimes the long list of preventive maintenance doesn't help when selling to the regular Joe on craigslist...it can scare them off by thinking it's not a reliable truck to own...very few people are still interested in v8 BMW's nowadays..especially E53's..
In my opinion , a more relaxed ad will attract more interest..

Whoever is looking for a 4.6is already knows it's rare..

Not trying to sound like a jrk just trying to help ..
GLWS

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2006 X5 4.8is LeMans Blue / creambeige interior
Prod.date: 2006-06-21