[CNGBiFuel]

With the usual tosh on this subject sent forth, I'll go against the tide then...

Nivomat are made to such supreme quality that they'll do 200K easy. Whereas any so called 'upgrade' boyracer-grade stuff by Koni etc??? You will lucky to see them do half that.

A set of Nivomats are four times the price of that garbage for a reason.

What ends the life of a Nivomat is the gaiters. By now most are in bits, and perished, hence the cr*p gets in the seals, and that ends them. Nivomats are double-sealed but the dirt will beat the seals in the end.

So...

If you don't care what they look like, and most look poor by now, replace the gaiters. Because if they maintain their level, they're still good.
No other shock, short of the Citroen system comes close, and no other shock does what they do. Not 'just' for towing, they were fitted stock to all go-faster R models becausee they work best of all as a road-performance shock. If you've the cash, Nivomat it is . 90s Ferraris, the Rover Vitesse and some Jags have them

Mine have been on for 240K, but had a set of motorcycle fork gaiters cobbled on at 90K. I don't suppose they would have seen another 20K if I'd left them with the original gaiters.

Volvo sell originals. See piccy.
(Nivomat Boot gaiter bellow 1387105)

The secret to their quality is the double-seal on everything and the gaiters protecting them. There's only one reason to take Nivomats off, and that's because they were left, gaiters perished, for too long.

Off a race-track, for road-use and saving the aforesaid Citroen system fitted to Rolls and those mega high-end Merc systems there is none better than a Nivomat. To favour anything else is to admit not driving very far.

If you can determine the ride-level, (and you can't usually do this on a road-car), engineers... over a bloke with a box of spanners and shiny new Monroes, can set and maintain the suspension parameters, and thus the braking too.

Of course, if you've already got florescent blue heater-hose and painted your brake-calipers red...

But yes, they do cost so 'kin much.