You might be fine, you might have problems. It all depends on how it's previously been used and maintained, how you use it, how you maintain it.
In the case you mention, if it's had lots of motorway work, then that's a plus. Lots of town driving, stop/start work, that's a negative.
Your driving style, exactly the same applies. If you do low mileage, or urban driving, then it really isn't suitable. Sooner (rather than later), you WILL get problems.
If, on the other hand, you do plenty of motorway / dual carriageway trips, then you're far less likely to have those problems - or at least, they'll take a lot more mileage to occur.
Servicing is just as important. Get the oil and filter changed every year / 10k miles, whichever comes first. It MUST be the correct low-sulphur DPF suitable oil. Wrong oil or too long between services = more problems and bills.
Finally, fuel. Use the premium diesel fuels (Shell VPower, BP Momentum, etc), and you'll probably find EGR a lot less likely to carbon up and fail.
In short, nobody can give any guarantees on any particular used car and the lifespan and likely failure chances of the EGR and DPF. But you can greatly improve your chances of not having problems, or of those problems happening a lot later.
Sooner or later though, any DPF will get clogged up with ash and need PROPERLY cleaning (ceramex process, not some crap snake oil) or changing.
But that can happen as low as 2,000 miles (yes, two thousand miles) as one case I know of where an old man was using a diesel Corsa to drive a mile to the supermarket, then a mile back, 3 times a week), or it could take in excess of 100,000 miles.
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