, chief executive of the , told SAfm radio that management had offered to raise salaries by 10% the first year and 8% in the following two years.
"We are hugely disappointed with the latest feedback we have received from Numsa," Olivier said, adding that the three-year wage offer was "very reasonable" given the current economic conditions.
Numsa, 's main manufacturing union, wants double-digit wage hikes and better shift allowances.
General-secretary said the union was open to more talks with the employers, adding that discussions were at a "critical, critical stage".
Auto manufacturing accounts for 6% of 's GDP and 12% of its exports. The strike has also damaged the country's reputation as destination for foreign direct investment.
Car companies affected included BMW, Volkswagen, Toyota and .