My 2010 170TDI estate has 90K miles on the clock. It has the factory 'sports suspension' which is presume is lowered by 15mm. The rear shocks have been replaced a couple of years ago, and a recent test of the suspension indicates that all is well. It appears to be running stock original springs.   When I have more than two adult passengers it the car it grounds out on speed bumps and kerbs, taking a section of undertray off at times.   The ride height (ground to under the gua