So I finally got around to doing a compression test, 170 to 180 psi on cyl 2,4,6 which was fine, then 1,3,5 was 180, 170, 80.
threw down some oil into cylinder 5, compression went back up to 180.
Replaced the plugs while they were out, cylinder 1 & 5 showed some oil burning, cylinder 2 was running a bit lean.
Basically just did a quick tune up, put in half a quart of ATF with the motor oil and ran it for 10 minutes. New plugs and upped the weight of the oil to 10w-30.
I'm giving it a couple of weeks to see if I should bother decking the heads if oil consumption is still an issue. But not sure if cylinder 5 piston ring is done.
Lastly no misfires, no codes.