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2008 Silverado 5.3 liter engine is consuming a lot of oil, why?

I have to add approx. 2 qts. of oil every 2 months. There are no signs of leakage on the engine or on the ground where I park. What could be my problem?? I use Castrol 5w 30 Edge synthetic oil. There are no signs of smoke out of the exhaust. The truck only has 48,000 miles on it. The dealer said it was the rocker covers causing it and replaced them. Are there any suggestions as to my problem??

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  • Cars & Trucks Master
  • 21,873 Answers

The short answer is, if there are no external leaks, the engine has to be burning it thru the rings, crankcase vent, or valves.
You could burn a quart a week and not see any evidence until it builds up on the spark plugs over time.

Posted on Jan 23, 2013

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Posted on Jan 02, 2017

  • 91 Answers

SOURCE: Excessive oil consumption

synthetic oil has smaller molecules which is why it is good for new cars - it gets into more places. it sounds like your car has been taken good car of but it still has some miles on it. what is happening is the synthetic is getting past the oil ring on your pistons (dont worry) and a small amount is getting burned off (not enough to fail emissions or notice in the exhaust) this happens just because of old age (being anything over 60000)i would try switching to a conventional oil at least for one oil change and that will solve your problem because the bigger molecules in the conventional oil will have a much harder time getting past the oil rings on the pistons.

Posted on Mar 29, 2009

  • 7 Answers

SOURCE: oil consumption, no smoke, no leaks

Yes a crappy PVC valve can cause some of your problems but not necessarily all of them, they are cheap, I always replace it to start. The air cleaner housing being full of oil is like how the oil is being consumed. In addition to a PVC valve, there may also be a blow-by hose running into the housing. check to see what other hoses go into the housing & which ones have oil coming from them. I'm not familiar with the "Motor Honey" you mentioned but I rarely add additives to my Engine oil, especially if they are thickeners. The only stuff I recommend is a Quaker state or similar "High Mileage Oil". These semi-synthetic oils have additives to swell old rubber & cork seals in older engines and can help reduce oil consumption & leakage. Again, it may not be a total solution, but it couldn't hurt to drain out all of the existing oil & replace with a high mileage type & also change the filter at the same time. Never mix it with other oils, despite the manufacturer telling you it may be safe to do so.

Posted on Mar 29, 2009

Molson02536
  • 3854 Answers

SOURCE: 2010 Vibe Type & Quanity of Eng Oil

The 5-30W gives the oil a better heat range, so when you go to Florida, the engine oil keeps it's viscosity better.
The 5-W20 has a lower heat range and is great in the upper states and canada where the temperature is not as hot as Florida or Texas.
The 0-W20 is even better if your in the colder climate like Alaska so the oil is not that thick, and when you have the start the engine first thing in the morning, the oil can move quicker to the upper part of the engine. 
Best thing is no matter what oil you use, just as long as you follow the recommended oil change duration. Your going to be fine and have a long lasting engine and also make sure you warm up the engine first before running it hard to have the piston and cylinder walls expand the same time. As you run the engine hard when it's cold, the pistons expand quicker then the cylinder walls and after a few years. The pistons and cylinder walls will have to much play and you get piston slaps till the engine warms up. 
Good luck and hope this helps and the 5-W30 is more forgiving if you go over a few miles between oil changes. 

Posted on Jul 23, 2009

  • 1 Answer

SOURCE: Sooty exhaust and excessive oil consumption?

2006 C4S Tip, 26,000 miles Now in Porsche dealership having the engine stripped. They are suggesting that one of the pistons is starting to fail. Their diagnostic equipment shows no fault codes but further testing has shown that one bank is having to work harder than the other side. Their prognosis is a new engine. Do not let your warranty expire!!! Also see here: http://www.pistonheads.com/gassing/topic.asp?h=0&f=48&t=731645&mid=154532&i=0&nmt=OPC - Does this sound odd to you?&mid=154532

Posted on Aug 12, 2009

  • 3 Answers

SOURCE: overfilled engine oil on a

The oil was overfilled this could cause a large amount of oil to enter the exaust and possibly the intake depending on crank case ventilation conditions. If you are positive engine oil levels are adjusted perfectly(warm engine check level running for dry sump oil level ect.). Time is needed to burn off oil residue in exhaust system and intake. Warm up engine low rpm no load, drive vehicle slow with little boost over 5 mins slowly raise rpms for another 5 mins keep driving smoke will burn off while making other drivers mad. sorry just smile and wave.
The engine oil on this vehicle should only be changed by an experinced tech.

Posted on Oct 09, 2010

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