really awful
Typical Repair Cost:
No data
Average Mileage:
34,900 miles
Total Complaints:
1 complaints

Most common solutions:

  1. replace radiator, oil cooler and all hoses (1 reports)
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This problem may be covered under warranty. Ask your GMC dealer.

problem #1

May 132018

Sierra 1500 SLE 5.3L V8

  • Automatic transmission
  • 34,863 miles

click to see larger images

oil leaked into cooling system

While traveling home, low oil level light went on. Checked oil and it’s low. Added oil and 1 hour later the low oil level light was on again. Stopped and had it checked and found the oil and coolant mixed in the cooling system bottle. Built in oil cooler inside radiator leaked oil into cooling system. Dealer replaced radiator with oil cooler, all hoses and flushed system.

- mikie8190, Havana, US