Forgot to mention. Car failed its MOT on black smoke from the exhaust. I normally fill up with the Performance diesel for a couple of weeks before the MOT and do an "Italian tune up" just before the MOT. This time I forgot
You should have seen the soot fill the garage when he did the smoke test
So on the way home, got a 15 quid bottle of fuel additive and spent 10 minutes on the motorway doing 70mph in 4th gear. Soon cleared out all the muck in the system, plus it stopped anyone else tailgating me
Tomorrow it should pass with flying colours