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I purchased new 2008 Chevy crew cab LTZ 5.3L, noticed excessive oil consumption at 45,000 mil. Still holding 40 to 60 psi oil pressure I have owned 1999 & 2004 models with 5.3L engines and have never had this problem. By far, these are the best trucks that I have driven and owned. I believe its important to stay in contact with salesman/ service manager/owner of dealership until the problems are resolved/fixed. Ask or push for a demo to drive while truck is repaired. If dealer cannot resolve issues, Contact GM and make sure they are aware of the problem. I had to do oil consumption test. Stopped using the computer recommened oil change. Engine is using 4-5 qts every 2500 mil. Started changing oil every 3000 instead of just adding oil. I was told to do 6 oil changes, record milege and record changes on oil dipstick. Garage keep truck for 2 days. The work order states, This may be caused by two conditions, oil pulled thru pcv system or oil spray that is discharged from the AFM pressure relief valve within the crankcase- GM bulletin from 2007. Mechanic removed valve covers and found oil inside intake manifold. Service manager advised me to bring truck back and have engine oil check every 1000 miles. I have been a backyard mechanic for 30 years, this may end up being valve stem seals, piston rings, etc.Report it
To avoid AFM on Chevy trucks, one could formerly select the 6.0 liter engine. What was a good choice (going with the 6.0 liter--no AFM) definitely worked in the past, but guess what? The new 2014 Silverado's now have AFM in all 3 engines: 4.3 V6; 5.3 V8; and the 6.2 V8...per the new 2014 Silverado brochure I am now reading and holding in my hand. My personal research on the internet has observed "excessive oil consumption" in the 5.3 V8's from 2007-2011, and a hint of it in the 2012 5.3 V8. I do not trust GM to do what is right, but only to act in their own personal self interest as it "hits the bottom line". This will eventually result in a loss of market share...once everyone starts talking about it, and the news spreads across the USA and other countries. Before buying any vehicle, I recommend carcomplaints.com; This is how I picked a "sweet spot" in the 5.3V8 engine for 2006. It was the last year...before they started to place AFM in the 5.3; Our 2006 Suburban with the 5.3V8 burns no oil, while having over 150k miles. What "new" vehicle would I buy? Definitely not a Chevy truck, although they look good! Unlikely a Ford truck, although most other people are buying them. Possibly a Dodge truck, but owning a 1977 Dodge Aspen "turned my stomach" against Chrysler products for life. My conscience would object to a foreign truck. I don't really know!Report it
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