On Sunday ....... After 40 or so motorways miles travelling at 70mph'ish I parked up at my sisters house. Afer about 2 hours I jumped in the car and the engine sounded very rough and really clanked/growled when rev'd sounding like the works old transit vans. The idle was steady at about 750rpm and it drove the next 3 miles through the town ok but sounded really clanky/agricultural through all the gears and only seemd to smooth out to normal at 3000rpm. After about 3 miles it just stopped and went to its normal smooth and reasonably quiet self. Is this the noise people are talking about? It was'nt that loud or that noticeable especially with the radio on. I only heard it initially as I was sat with the engine running, window down and stereo switched off (normally it comes on withe the ignition) talking to my sister before I drove off. Definately would NOT be a cloggged filter as I'd just travelled a good distance on the motorway and had a couple of blasts from roundabouts.