Finally some satisfaction, The dealer called me yesterday, said they are going to change the pistons, rings and not sure what else. After the 4th oil consumption test in past 3 years, at 1800 kms down over a liter of oil this test, ( every oil test done engine was consuming oil and they brushed it off as normal, 5-7k oil barely touching dip stick) Is there anything I should get them to change besides this or ask?? 2011 Gmc Sierra SLT 5.3 lt aluminum block have 92,000 km on it. All I can say what a piece of junk.