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jabres
Ohio
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Joined: 06/14/2016
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Been a diehard Chevrolet gas, engine truck person my entire life. Use them very hard in my landscaping business, and the 6.0 gasoline never missed a beat. unfortunately the 6.0 gasoline is nonexistent, and I had to buy the 6.6 but I’m not happy about it. It has been burning oil since day one. Roughly every 5000 miles, it’s using 2 1/2 quarts of oil. it might even be more than that, going through an oil usage test with the dealer now. Anyone else have similar oil burning problem with their 6.6 Chevrolet gasoline? If it was an older truck, I would understand, but I just spent 50,000 and need to carry quarts of oil in my truck.
Thanks!
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WNYBob
Tonawanda, NY
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I was told a long time ago by a dealer, that excessive oil consumption is "1 qt./1000 miles" or more!
That was 40 years ago.
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mkirsch
Rochester, NY
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Joined: 04/09/2004
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I agree. They have a threshold for oil usage. Below that, nothing wrong. Above that, they'll do something about it.
Unfortunately you're in that space where the consumption is irritating but not bad enough that they will admit to a problem.
Judging by the lack of response here, either there aren't a lot of members that will admit to owning 6.6's or nobody else has this problem.
I'd say check on one of the GM forums but in my expeience, all they want to do on those sites is blame everything on you and some obscure made-up maintenance task that you failed to perform.
They (the GM forums) will probably tell you that you didn't break in the engine properly.
* This post was
edited 04/24/23 08:23am by mkirsch *
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ksss
Eastern Idaho
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If you get on You Tube you will see some discussion of it. Is the pickup under warranty? I believe the last number I heard was one quart every 1200 miles was GM's line. Hopefully the dealer will get you some help. This seems to be hit and miss on who has the issue and who doesn't. I don't know if they got some bad rings on certain engines or what this is about. On other issues such as Duramax fuel injection issues with the Bosch system used for a while, GM has been pretty good about accepting issues under warranty. If there are a bad run of 6.6 gas engines, hopefully they do the same here.
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Michelle.S
Western NY till fall, then Sebring, FL
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Ha, oil usage, remember the Chevy Vega?? Had a '72 fun to drive with 4 speed, but pull into a station, check the gas, fill the oil. Was carrying a gal jug with oil marked in quarts, would drive until the oil light would flash when cornering, stop and add a quart.
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opnspaces
San Diego Ca
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When I worked for Toyota in the 90's the acceptable consumption was 1 qt every 1,000 miles. As already said the manufacturers had to have a spec to go off of. To the general population it probably seems unreasonably high. But it's the spec they came up with.
Here's to hoping that GM does something to help you out.
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Grit dog
Black Diamond, WA
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If the General won’t step up and considers it “normal” I might suggest considering a warranty replacement by “other means”. ![[emoticon]](http://www.rv.net/sharedcontent/cfb/images/wink.gif "wink")
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Grit dog
Black Diamond, WA
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To mkirsch’s point. That new engine came out during the height of the Rona so as with all mfgs, less vehicles were produced and sold over the last 2-3 years.
Additionally, unless did hard GM and die hard gasser, the 6.6 was and still is the turd in the punch bowl. Anyone objectively looking for a HD gasser wood likely immediately dismiss the GM 6.6 for obvious reasons.
Lowest of the big 3’s other 3 HD gas options. The 6.4 Dodge, and 6.8/7.3 ford all make more power.
And to add insult to injury GM is still dropping the old 6 speed behind them when the other 2 mfgs have been offering 8 or 10 speed slushboxes for years now.
Not an excuse for an oil burning pig of a new truck though. Best of luck to the Op getting this resolved.
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Michelle.S
Western NY till fall, then Sebring, FL
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You realize a quart every 1000 mile, and figure you change oil every 5000. You'd never need to change the oil again, just change the filter once in a while.
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Dadoffourgirls
China, MI USA
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Grit dog wrote:...
And to add insult to injury GM is still dropping the old 6 speed behind them when the other 2 mfgs have been offering 8 or 10 speed slushboxes for years now.
...
Grit - time to stop with the insult. We know your hatred for GM. The 10 sp is now the transmission behind the 6.6.
I have used the 6.6 for towing goosenecks with 15k lbs, with 6 sp. Hopefully will get the chance to put 6.6 with 10 speed through same workout.
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