2011 CHEVROLET SILVERADO 1500

5.3 aluminum block active mgmt. engine look out

I have the Z71 package all star edition. Which properly equipped mean rancho shocks hd cooling hd trans cooler hd engine cooling and skid plates. I bought this because my son in law is driving an 04 not hd but 4wd with over 250,000 at the time. Maintenance issues because he doesn't, but engine was using about 1qt. to 1.5 per 3000 ran well, and frankly this 11 Silverado I bought with 60000 miles was less than a comparable Dodge with a 5.7. I noticed at approx. 85,000 this 11 was using a quart of oil in under 1000 miles on oil change. Then suddenly at about 90,000 and truck over 3 years old it was missing so badly all warning lights were flashing before I got it to GM dealer 10 miles from my home. Told sr. mechanic, who is not only a good person but a superior mechanic. About 20 minutes after limped into shop he came in handed me my keys and said #1 cylinder plug insulator was cracked, showed me the old plug and said, these 5.3's have a known issue with the #1 and #7 oil rings going bad because of active engine mgt. system is faulty and when engine goes into 4 cylinder mode the oil sits on top of the piston creating an extraordinary build up of carbon and it breaks the inside insulator in the plugs. Told me around 4000.00 to re ring engine I carried plugs with me for the next 4 months trying to get my extended warranty I purchased with the truck to cover the repair. I had to change #1 #7 #2 #4 plugs in one day, all fouled. Called the attorney general of my state had all documents for oil used, and I believe 10 plugs in total. Very quickly the warranty company called telling me the had authorized an entire new GM engine. Another 3 yr 100,000 warranty now, so I better get her gone before the new engine warranty is up. I was told by 2 GM dealers over 100 miles apart they had re rung so many 5.3 engines they could now do them eyes closed. Shame on GM.