oil on track?

I was racing in the A class league hopper today on Bathurst and going down the hill I could swear there was oil or water spilled on the track. Both people in fron and behind me started sliding as well as me. I could not get it under control until I ws at the bottom of the hill. Has anyone ever seen a spill on the track because I haven’t. Or did Turn 10 add that in since they’ve turned the collision off. I suppose I could have imagined the whole thing to

Lag

Have had that happen in some of the private races I do. Someone won’t have a great connection, and everyone gets a slick spot in the track to deal with it.