wfd2

I have a 2003 Suburban Z71 5.3L. Used oil at what I thought was a rapid pace-- 1QT every 1,500 miles since 12K miles. I always did oil changes per recommendations with good, quality oil. (I have a '86 F150 302 farm truck that uses none, still to this day.) Brought it back to 2 dealers and they say "normal". Ok, whatever. Then, at 77k miles, both heads cracked and before I knew what was going on I think the antifreeze scored up the cylinder walls. Dealer got involved, said Aztec heads are prone to cracking (TSB issued) and it will cost $3000. Ended up fighting with GM and they covered under semi-warranty and I paid $1800. Dealer replaced heads, but smokes once in a while now. Still using high amounts of oil, 2QT every 1,500 miles, but now have 160,000 miles on it. No real power left for pulling horse trailer, so a replacement engine may be on it's way. Bottom line, my engine always used oil.