There seams to be a lot of silicone to me. I would be tempted to try a different air filter, whatever brand you have in there now is not doing a very good job.
I'm using the stock Denso filter. I change them every year or two. High silicone numbers seem to be normal from these engines. Takes a long time to "wash out." Just replaced it with a new one.
The previous oil was Castrol Edge 0w30.
So the viscosity on the 0W-30 was thicker than the 0W-40 even with a 789 km longer OCI?
Surely 10.65 cSt @ 100C is out of spec for a 0W40? Virgin values for Castrol 0W40 typically 13+. Shouldn't be a problem for the engine though, that factory fill looks like 0W20.
I didn't even look at that number since the OCI is so short, but it does look like it sheared down into 30w territory. The car was stuck idling in traffic a lot more so maybe that's the reason? I'm not too worried though.