Any Issues With Late Model 5.3l Engines Regarding

[atikovi]

I recently got an '08 pickup with 90,000 miles that uses a quart of oil in less than 500 miles. No leaks so I'm pretty sure its getting sucked in from the valves and not a ring problem as there is no smoke when stepping on the gas hard. I get a lot of smoke when starting it up, and if I'm driving in the mountains on a long downgrade with my foot off the gas, at the bottom of the hill when I get back on the gas I also get a big cloud of smoke. Probably the high vacuum situation from coasting down the hill sucks oil past the guides or oil seals and is burned when I step on the gas again. Is this a common issue on these engines? Is there a way to tell which it is, guides or oil seals? I assume the oil seals can be replaced with the head still on the engine?

[Alljackedup408]

08 with 90000 miles... holy cow!

[66nova]

I recently got an '08 pickup with 90,000 miles that uses a quart of oil in less than 500 miles. No leaks so I'm pretty sure its getting sucked in from the valves and not a ring problem as there is no smoke when stepping on the gas hard. I get a lot of smoke when starting it up, and if I'm driving in the mountains on a long downgrade with my foot off the gas, at the bottom of the hill when I get back on the gas I also get a big cloud of smoke. Probably the high vacuum situation from coasting down the hill sucks oil past the guides or oil seals and is burned when I step on the gas again. Is this a common issue on these engines? Is there a way to tell which it is, guides or oil seals? I assume the oil seals can be replaced with the head still on the engine?

 

I can't say that I have heard of anyone having problems with the valves stem seals or guides, but it certainly sounds like that could be your problem. I also haven't seen too many 08's with 90,000 miles.

 

If I were you, I would call your local dealer. You still have powertrain warranty up to 5 years or a 100,000 miles.