sudden loss of rear traction

[200sx]

Did anyone else experience this last night?

My buggy was fine up until round 3. I made a mistake on the right angled tabletop and immediately after I couldn't keep it in a straight line. The car itself is fine but there was an oily residue on the rear tyres, not from my shocks.

I changed the tyres and all was fine for a few laps until i repeated the same error.