The SCB has two major objectives in developing this Environmental Code by a) encouraging Promotions to manage in a way that is sustainable for the environment and b) allowing Promotions to demonstrate to Local and National Governments that it is a responsible Member of the community, with the ability and willingness to contribute to the protection of critical aspects of the environment.
This Code seeks to improve the relationship between Speedway and the community by paying particular attention to a) noise, fuel, protection of the ground, waste disposal and cleaning and b) the behaviour of all persons involved (directly or indirectly) e.g. spectators, promoters, riders, track managers etc.
7.1 SCB appointed Environmental Audit Officials may inspect and report on a Promotions adherence to this Code. S/he shall have access to all information.
7.2 Track Environmental Marshals shall make recommendations in respect of improving the environmental conditions by riders, Officials and spectators.
7.4 Fuel and oil must be handled in the correct manner, particularly in a way that avoids spillage
So, accident or otherwise, it's not actually against the rules to pour oil onto the track. It is however a rule that riders use an oil catcher.