Engine oil consumption
Guys, if it were me, I would do a few diagnostics first before tearing anything apart.
One quick check would be to do a cylinder leak-down test. Get the piston at TDC on compression stroke, fill the cylinder with air using fitting in the plug hole and listen for escaping air. If you hear air leaking into the pan, well that means a problem with the piston/ring. Leaking into intake/exhaust manifolds, probably valves.
Most people check compression only, which is ok, but that really doesnt pinpoint the problem area.
Ottawa Engine and Performance