got a mk4 fez with 1.7 puma conversion. seems to be burning oil and has a constant blue haze off smoke coming out the exhaust when going over about 70mph. if you let off the throttle then plant it again a big cloud off blue smoke comes out the exhaust. car still runs fine drives fine and starts fine. i am looking to sell the car but cant sell it as it is.
Has anyone ever heard off these engines using oil, valve stem seals? piston rings?

i am probaly going to change the engine, does anyone know is the 2 litre black top engine drops in? or is it best to go puma? cheers.

 

Check the oil breather hoses, it's not uncommon for them to block up or to collapse under vaccuum, giving the symptoms you describe.

 

Valve stem seals as an educated guess