heavily weighting my option on a s500 or v8 s-class w221(non amg)
was told there are some reliability issues, so it would be nice if i can get a heads up on what they are and replacement parts to improve all its known niggles and eventually get the car bullet proof
They're bonkers crap. Suspension, electrics everything goes on them and it's £1000 at least a go - budget £5k a year to keep it tip top and you'll be fine.