Hello everyone, google bring me here as my car has some problem. Would be great if someone can give advices. My car has blue smoke 20k miles ago, it happens every cold start. The clock was showing 130k miles. I was using 5w 40 engin oil to top up. The smoke could last 2 mins in the summer morning. My clock is showing 154k miles now. It still has blue smoke from every cold start, especially in the morning, but getting less about 15 seconds. The different is I'm using 5w 30 engine oil, and the weather is cold. Apart from the smoke, everything works fine. Oil consumption is 2500 miles per liter which not bad. Audi says I might need replace all injectors and the cylinder head, quoted Â£4700 inc labour, but I haven't had any trouble with that, the car still runs. I'm just worrying about the mot, don't think the smoke would let me pass. A little history: the car had been broke down on motorway coz the inter cooler pipe connector was disconnected, the AA ppl fixed it, but he says he find some engine oil sticked on inside of the pipe, so there should be some kind of leaking? Car: Audi A4 estate, 57 reg, 1.9 tdi, 154400 miles 99% motorway. BRB engine.