Shane van Gisbergen is still a little miffed at losing the V8 Supercars series lead.

The Kiwi driver was on track for victory in the second race at Symmons Plains before an oil spill from a competitor saw him slide off the track and out of the race.

van Gisbergen has slipped back to seventh in the overall standings and says it's still a bitter moment to reflect on.

He says he is his harshest critic and has replayed the moment over in his head many times.