Posted by Chris Jones on December 08, 2011 at 07:22:57 from (98.26.240.6):
Oil is disappearing from my 2001 GMC Sierra 1500 4.8 V8 auto trans. I must admit I don't check it much. I still view the truck as new and figure it shouldn't be using any. Up until early 2010 it was a second vehicle and not driven much. At that time it only had 24000 miles on it. I then lost my car and started driving it full time. It was shortly after that that the low oil level light came one once on an incline. I pulled into a parking lot and checked the level and there was no oil on the stick. As the oil pressure was ok I drove to the nearest store and bought a quart of oil. Put it in and the stick read top of full. I blamed that on the tire shop that I'd allowed to change the oil after putting on new tires. I figured they dumped 5 instead of the required 6 quarts in it. But since then it's happened again.
Today at 38,500 miles I checked the oil level and mileage since last change and I'm at the bottom of full on the stick and it's been 3,500 miles since last changed. It's parked on pavement and there are no leaks. The underside of the truck is clean. I don't see any hint of burning oil either.
Only other oddities of it's running are in the last couple years when it's like 20 deg or less when started it has a light knock for the first 30 seconds to a minute as I pull out the driveway. It also has a slight ping at times under load. I don't remember either problem in the early years but then I didn't drive it much then and might not have driven it in the very cold. And the ping might be due to the new gas formulas. I've read that other owners are being told by dealers that the knock is "normal" as a result of low friction piston rings and the cold.
Is it normal for the truck to be using that much oil? Are there simple things that might be wrong to cause this that I can check?
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