Hi, everybody! My old sweetheart (Golf 4 TDI PD) has not reached the top speed for some time now. In the acceleration I can subjectively notice no big difference. But from 190 km/h after Tacho the car becomes quite loud; it is from about 190 then a (and with increasing speed louder) “hole” noise, as if somewhere a resistance were – I can not describe it better. VMax according to Tacho was always almost 200 km/h. That then also fit GPS- This winter, however, the car was driven for the first time extremely short distance. What I also noticed are light jerks in idle operation. When I once filled A*al Ultimate Diesel, the acceleration was better and the car was subjectively quieter in idle. The AGR valve (no, it is not locked!) and the intake bridge are clean, so fall away as an explanation. I have a follow-up with the registered 188 km/h. The fault memory is empty. equipped HJS CityFilter, which should not be able to clog up. As far as I know, however, the soot is also collected at the things until the necessary temperature is reached for regeneration. –>What happens if this does not happen long ago? Where is the soot actually, if not regenerated yet? –>Can I safely drive on the BAB full throttle for longer and bet that the filter – if it is on it – is then completely burned free and the VMax slowly climbs again t? (It’s not about torturing top performance out of the old fuel oil diesel – but I still find it funny and the jerks are not really tingling.)