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The Retail Motor Industry says reports of striking Numsa members intimidating non-striking petrol attendants and other workers, are being discussed with the union.
RMI's chief executive, Jakkie Olivier, says they've received reports that some people had been hurt.
He says they're having daily meetings with Numsa to deal with these incidents, adding that the union has agreed to intervene.
Olivier says these meetings are merely to monitor that the strike complies to the picketing rules.
He says on Monday that the industry and unions had agreed to picketing rules on Friday, and that these included a clause allowing employers to use casual labour while the strike lasted.
The employers' latest offer is six percent across the board.
The union has demanded, among other things, a R30 an hour across the board increase by 2016 on actual rates of pay in all sectors and divisions for workers earning above R6000 a month.
Ngobese previously said workers' demands should be understood within the context of rising living and transport costs.
