TORONTO — Some workers at General Motors’ Oshawa, Ont., assembly plant will be offered retirement incentives of up to $150,000 as the automaker prepares to cut most jobs at the plant.

That’s according to a bulletin posted by Unifor Local 222, which represents about 2,600 hourly workers at Oshawa. The bulletin also notes production of the Chevrolet Impala and Cadillac XTS sedans will end there in October, later than the initial summer timeframe offered by GM Canada. Pickup final assembly will end “on or before” Dec. 31, though the bulletin notes that GM would “provide written notice should there be any extensions.”

The details come after GM last week said it would spend $170 million to convert Oshawa into a plant that builds aftermarket parts for GM vehicles and does stamping for the automaker and, potentially, suppliers. The company will also build a test track on the site that will allow for testing of autonomous- and advanced-vehicle technology.

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