Johannesburg - An agreement to end the strike in the vehicle sector was expected to be finalised on Wednesday, the Retail Motor Industry Association (RMI) said.
CEO Jeff Osborne told Sapa negotiations were proceeding with the National Union of Metalworkers (Numsa) "at a hotel near the airport".
The parties were "hopefully" in the closing stages of negotiations and there were "high expectations by all parties" a deal would be reached later on Wednesday. Details would be shared with the media when the agreement had been signed.
Last week Numsa members rejected a 10% wage increase offer.
Osborne said he was not aware of a march in Boksburg by Numsa workers on Wednesday.
Earlier, in a separate statement, Numsa claimed 7 000 members - employed at petrol stations, dealerships, bus and truck body building plants, tyre factories, car maintenance and repair workshops - would take part in the march, to be led by union president Cedric Gina.
According to the union, a memorandum of demands would be handed to the RMI and Fuel Retailers' Association at the offices of vehicle manufacturer Mercedes Benz at the East Rand Mall in Boksburg north.