Blow by / positive crankcase pressure

Espace 1.9 dci

I took off oil cap sbd I am getting strong puffs of air coming out like a steam train no smoke cold engine but I do get smoke if I take off cap after driving

history is after oil change and engine flush I was getting a strong smell of heat/oil burning after driving. a few days later it started to smoke for 2 seconds on ignition and pulling away from cold start. about three times it belched out a smoke screen while on dual carriageway.

It used all of oil plus about another liter in 200 miles

Smoking has now stopped also no smell for past 2 days only done short town driving but that was enough in past for smell. not sure why it's stopped don't its miraculously healed its self lol

I put oil to halfway today and noticed oil residue was all way up to top of stick. So I took off Cap cold engine and turned on ignition and lots of air and some oil spitting out not a lot but spots.

Is this normal. Or could it be excessive blow by from pistons or blocked breather. Stuck piston?

if it is pistons seals how much am I looking at?

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Blow by / positive crankcase pressure