It won't start

[twinturbo]

whislt the plugs are out and if your not replacing them, give them a clean with some wire wool.

Pouring oil down the bores is nothing to do with oil preasure, it's purely to try and raise compression if the rings are thought to be letting combustion past. I would imagine it would be firing anyway but a little badly.

Dirty, damp plugs is a prime suspect if there is a spark. Or Static timing.

If your drawing fuel you should smell it on the plugs.

TT