[DG330]

Hi,

As the title, seriously fed up with hunting down my blue smoke issue:

Symptoms - start up puff, followed by a stream until warmed up (80-90c) continues with revs increasing to 2/3k, clears with a few throttle blasts. Normally 2 WOT which is 1 light blue, followed by a grey then it's light black. After a good run, it creeps back quickly. Doesn't appear while driving, but will puff out a blue cloud on WOT after being at lights.

The car - Dpf and remapped, egr in place. 155k. Remapped and dpf solution by previous onwer and owned since 132k. No issues until last year.

What I've replaced:

Recon turbo (little play, no in or out)
Febi rocket cover
Glow plugs x6
Glow relay
Both thermostats
Febi CCV breather
Ultrasonic cleaned injector nozzles tips
Ultrasonic EGR
Checked vacuums
New egr pressure solenoid
Checked compression on all 6 with tester 380/390psi and 150/170 on first crank.

I'm sure there is more that I've replaced, but can't remember.

All I'm left with is either head gasket leaking one way into cylinder, or valve seals.

One thing I have noticed is, after an oil change, the car smokes a lot worse until it thickens up with blow by etc.

I've tried with mad unplugged and it helps the black smoke on WOT but idle smoke is still there.

Advice please?