Went for an oil and filter change last night
But upon inspection, I have some serious oil leakage. The whole underneath of the engine was covered in a layer of oil.
The gearbox was covered in it. Looks like there is a leak coming from either the rocker gasket or vtec solenoid, or both.
On the other side, the sump was also covered in a layer of oil. Not sure if it's the sump gasket or if it's coming from higher up.
On top of that, to make things worse, the sump itself looks pretty corroded too

But when the car is parked up, it's not leaving any oil on the floor under the car.
We gave it a good blast with brake cleaner to clean it all up and dried it all off. Going to take it back next week to see if we can get a better look at where it's leaking from.