The only oil slick I encountered, touch wood, was going in a straight line. Motocross experience from way back when helped and I got the rear in check instantly.
Some roads the diesel slicks are worse but I have only really had issues once with an oil slick.
Many years ago before the speed limit was lowered, starts to get a speed up, tips into a right, sees a line of oil way to late, had to go across it or pick up into the trees so went across it, slid but caught it somehow although by now was headed off the road but at this point was a dirt pull over spot that was entry to a fire trail. Ended up 30 or so feet off the road but upright although guys behind me were not all as lucky.
Found out later that it was a deliberate oil slick put down by one of the local towing businesses to get a few jobs for the day.
He ended in court as the cops got involved, as for what happened to him well rumours are he had a few 'falls' across the next few years that saw him get some bruises