Blue Smoke (Burning Oil)

Check PCV system.
Check engine mechanical condition. Check valve guides, valve stems, valve seals, oil drain passages in cylinder heads (Blue smoke on start-up), piston rings and cylinder bores. White Smoke (Water In Combustion)
Visually check for coolant leak in by-pass air valve.
Check for cylinder head gasket leaks, intake manifold gasket leaks and cracked engine block.