[oldbilly]

excellent write up! I change all my filters about 2 months ago on my 06 330d and intend changing the oil filter every 6k and air filter every 12k, also if your fuel economy is still low after replacing the filters have a look at the egr thermostat £30 odd quid and takes less than 15 minutes to change and can make quite a difference to the mpg, its very difficult to tell when they fail, my engine has done high mileage so just changed everything inc the main thermostat too!
Just one question, what condition was the heat material under the your plastic engine cover like? mine crumbled and fell apart so I used some under bonnet heat material off another vehicle cut to size to fit under the plastic cover.