Hi guys, Good to see so many familiar names from TA. I've come in the search of a Honda boffin formerly known as CJ!! I've had a problem with my car since I've bought it over a year ago. It hasn't got any worse, but I'm still wondering what it could be. I asked on TA a while ago and didn't have much luck. My car 2004 cdti saloon has a puff of oil smoke on startup. On warm or hot start up its not really there but more pronounced when left overnight and started first thing in the morning. It clears up straight away. It is definitly oil smoke. The car uses oil about 500ml per 3000 miles which I know is within tolerance. I only use 0w30 fully synthetic. Some people have told me to start using thicker oil but I don't want to. I'll happily keep an eye on the oil level and drive. It drives perfectly fine and I've put 10,000 miles on it and had no other issues. Initial internet problem solving revealed possibly valve seals but I'm not sure how to confirm this. I don't fancy getting major surgery done for just a puff of oil smoke. However, the internet is littered with all sorts of other suggestions like PCV valve and turbo seals etc which all also make sense. Again how do I cofirm? If it is the turbo then ultimatley it'll pop its clogs and I'll get another when that happens. Has anyone any experience of this? Also can someone explain how the crankcase ventilation system works in the CTDI. Seems like could be something blocked there. BTW, this problem is more severe or noticable in the summer. probably thinner oil due to higher temperature getting into places it shouldn't. Any info much appreciated.