Got a few things going on here, I'm starting to loose track lol. It's not the matrix that leaked, the little pre heater thingy behind the right fog light was weeping but when I started using the car again, for some reason it's stopped and doesn't need topping up. Anyway the point is I know water isn't getting through the gasket.
The glow plugs don't have seals. They seal themselves on the thread. There's no rubber or anything to seal them in. I've never actually known one to, there weren't any on the old ones, new ones didn't come with any.
The cylinder that had the wet plug was (working from the front of the engine) the 2nd one. Also o can't see how the cam cover gasket can cause oil to get onto the plugs ie into the cylinders. Wouldn't it only be possible via either head gasket or piston ring? But it can't travel up the chamber from the piston ring without being enough oil to cause other issues.
Or, can this be normal?