The automaker's union said it decided to stage four-hour strikes on Wednesday and Thursday and an eight-hour strike on Friday, reports Yonhap news agency. The union also said it will launch four-hour partial strikes on Monday and Tuesday as well next week. So far, the union has staged a combined 44 hours of partial strikes since it started wage talks with the management.

The latest walkout comes after management and the union failed to narrow their differences over wages. The two sides last held their 16th round of negotiations earlier in the day. The 40,000-member union is demanding a 149,600-won (US$105.6) increase in monthly base pay and a performance-based bonus equivalent to 30 percent of the company's net profit for last year.

The company, however, has offered an 80,000-won increase in monthly base pay, a performance bonus equivalent to 350 percent of monthly salary plus 10 million won, as well as 15 shares of company stock. Meanwhile, Hyundai Motor said earlier this month that its global sales declined from a year earlier in July, weighed down by production disruptions caused by partial strikes and weaker demand.

The South Korean automaker sold 318,454 vehicles worldwide last month, down 5.1 percent from a year earlier. Overseas sales slipped 3.2 percent on-year to 270,341 units, while domestic sales dropped 14.4 percent to 48,113 units. The decline marked the company's 10th consecutive month of falling global sales.