I've had problems with blue smoke on start up coupled with poor start up and fuel economy 27 mpg
This was posted on another section. After a full service and new glow plugs the problems persisted. The blue cloud would appear on start up but disappear straight away. Now it's cured, no blue smoke and 34-38 mpg. All i did was fill up with normal Shell diesel! I had been using Sainsburys diesel.
Might just have been a dodgy fill up but having googled Sainsburys diesel, it would appear that a lot of people have had problems which appear to be down to the bio content. Don't know if it's true or not.

If this has beEn covered already sorry just wanted to pass it on in case someone was suffering the same problems.

Diesel fuel is usually associated with black smoke, while blue smoke is oil burning. Only on startup suggests oil leaking along valve stems when engine is cooling and later being burned off on starting (also causes poor starting). Only guess is that the Shell fuel has a higher energy content and combustion pressure is now higher. Everyone can spread it - Anyone can catch it. Stay home - the life you save can be your own!

I thought it was burning oil, however it appears not to be using much if any. It's been in and out the garage having all sorts of test including a pressure test? I would like to think at 61,000 miles it's not the valve stem seals but I suppose time will tell. One source said that bio diesel can cause excessive blue smoke but who knows! Just thought I would mention it

You will normally get blue smoke if you're burning oil when engine is hot. If you have oil in the cylinders (eg from worn valve guides) you will get a lot of crud coming out on starting but also get smoke when accelerating and a rapidly dropping oil level. I think what you were getting was unburnt diesel, which normally suggests a glow plug problem. However if changing the fuel type cures it it may just be, as suggested above, that the Shell burns easier. I once had the same problem from dodgy valve timing (loose keyway on one of the pulleys), but that must be pretty unusual. Ex AA Series III LWB Safari - Gone
300TDi Disco (bought new - terrible car) sent back after 18 months
Freelander 1 Estate - leased, given back at end of lease
200TDi Disco (bought from a mate with 100,000 on the clock) - Gone
Disco 2 TD5 - sold and exported to France
FR2 TD4 GS - Gone
FR2 SD4 HSE - Now changed for a DS
New model ex-demo Evoque S 180 in white
Unable to order a new DS, so gave up. Now have a Volvo S90 Recharge.

Thanks for the replies,
No smoke etc after start up even under hard acceleration.
No oil use and no smell of burning oil. Hopefully just a combination of dodgy fuel & worn glow plugs!

Blue smoke on start up normally means the turbo seals are on their way out, but wouldn't explain the low mpg so I wouldn't worry about it.