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Author Topic: Costco Gas Winter Additive Back to Topics
FLASH1

Rookie Author
Twin Cities

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Message Posted: Dec 2, 2012 5:52:21 PM

Does anyone else have problems with Costco's winter gas? I have noticed (and my mechanic backs me up) that the check engine light lights up on my 2004 Yukon XL when Costco adds the winter additive. I wind up running Holiday or a like fuel. I have also heard from Suburban, Sierra, and Silverado owners who have the same experience. Anyone else?
REPLIES (newest first) Post a Reply
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giwan
Champion Author Michigan

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Message Posted: Feb 20, 2013 9:01:24 AM

Why do you believe you need to add this winter blend?
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DoctorV
Champion Author Detroit

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Message Posted: Feb 20, 2013 8:59:24 AM

All winter gas is not the same.
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MertieMan
Champion Author Lexington

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Message Posted: Feb 20, 2013 5:19:48 AM

Its not only Costgo, its all gasoline blended with ethanol and their stupid winter blend. It causes at least a 1-4 mpg loss in gas milage.
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rex0000
Sophomore Author Indianapolis

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Message Posted: Feb 19, 2013 10:24:33 PM

Only shell for me, sir.
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MertieMan
Champion Author Lexington

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Message Posted: Jan 26, 2013 8:39:42 AM

All winter gas is basically the same whether it comes from Costgo or any place else.
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EdPG
Champion Author Boston

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Message Posted: Jan 26, 2013 7:31:28 AM

Run both cars on Costco Gas {2013 & 2007} NO PROBLEMS !
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tdioiler
All-Star Author Detroit

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Message Posted: Jan 25, 2013 10:29:29 PM

Maybe in the cold weather the gas cap isn't sealing right. All the vehicles you list are supplied by the same cap manufacturer.
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Mr1lung
Champion Author Phoenix

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Message Posted: Jan 25, 2013 3:28:32 PM

No issues
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BUSSY
Champion Author Dallas

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Message Posted: Jan 25, 2013 2:10:50 PM

I have never used Costco gas.
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Texacoguy
Champion Author Tampa

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Message Posted: Jan 25, 2013 1:53:20 PM

Costco does not have a proprietary winter additive...
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DoctorV
Champion Author Detroit

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Message Posted: Jan 25, 2013 11:01:26 AM

Maybe it's the ethanol in your gas? Or the source of the ethanol that Costco's supplier is using?

http://www.mda.state.mn.us/Ethanol
http://www.mda.state.mn.us/en/renewable/ethanol/about.aspx

Or maybe the Kirkland detergents Costco is using:

http://www.costco.com/gasoline-clean-power.html
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TXBruin
Champion Author San Antonio

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Message Posted: Jan 25, 2013 10:30:57 AM

no
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travelzonecente
Champion Author Riverside

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Message Posted: Dec 29, 2012 10:47:30 AM

Gas is Gas... Costco buys it gas from Chevron and Mobil... and Sometimes ARCO...
They all buy from each other...
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Z12
Champion Author Toledo

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Message Posted: Dec 5, 2012 8:55:41 PM

Never had problems
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MIT05
Champion Author Massachusetts

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Message Posted: Dec 5, 2012 2:32:20 PM

Never use additive.
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HeavyDuty_cache
Champion Author Omaha

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Message Posted: Dec 5, 2012 8:50:55 AM

Thanks brerrabbit.

I use Diesel Fuel and I have issues with most brands #2 (Winter) diesel. My MPG goes down by 2 or 3.

Only when I use Kum & Go Diesel Fuel I have a little better luck. They use Power Service as their winter additive.
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2Tall
Champion Author Maryland

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Message Posted: Dec 5, 2012 6:16:11 AM

no
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borsht
Champion Author Oakland

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Message Posted: Dec 4, 2012 11:31:37 AM

An excellent reply by brerrabbitTX.
Sometimes symantics confuse the issue. Read his comments and understand that it is the vapor pressure of the fuel that is different. In very cold climates, there is much more butane in the blend. In the summer the blend is modified by removing much of the butane to increase vapor pressue.
The enrgy value with high butane is a little lower pfer gallan, the same per pound. But the blend change has nothing to with additives, it is just the percentage of blend of the various distillates. All gasoline is composed of many distilates. The octane rating measures how it burns in comparison to a simple pblend of heptane and iso octane.
Thank you brerrabbitTX
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BUSSY
Champion Author Dallas

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Message Posted: Dec 4, 2012 10:14:04 AM

I don't use Costco gas.
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valby
Champion Author Massachusetts

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Message Posted: Dec 4, 2012 9:52:11 AM

No
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brerrabbitTX
Champion Author Houston

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Message Posted: Dec 4, 2012 9:26:55 AM

I work for an oil Major in the Wholesale fuel group and deal with gasoline blends every day. There really is no such thing as winter additive for gas. There is for diesel. In diesel you either get ULSD #2 with a winterizer or in extreme conditions you may get #1 diesel which is really more like kerosine. Some places cut the #2 with some #1.

For gasoline the difference between summer and winter is the RVP. RVP is reed vapor pressure and is the amount of pressure that results from heating the fuel to 100 degress and measuring the pressure. This pressure really has to do with the vaporization of the fuel. When gas is injected into engines it does not go in as a liquid but rather a vaporized mist of fuel. It burns more effciently and more completely that way and less is wasted through the exhaust. In the summer Federal regulations state that the RVP for gas must be 9.0 lbs or less. Certain areas like KC and Atlanta have 7.0 lb requirements. Others like Portland Oregon require 7.8 lbs. During the winter the RVP of gas goes up to 15.5 lbs. This means more vapors and easier vaporization of you fuel in your engine. The RVP also has to do with how fast you gas evaporates and therefore how many harmful emmisions gas puts off. Obviously in the summer you want lower RVP to limit emmisions, however in the winter for your engine to run right and start you need the higher RVP. The way they lower RVP in the summer is to remove the butanes from the gas stream. This costs money because it requires more refining. Hence the reason gas prices go up in the summer starting in May. RVP rules cease on September 15th every year thus the reason gas prices usually come down in the fall (absent a storm or other event). The butanes they remove from the gas in the summer is either sold at that time or in many cases stored till the fall and winter when they are reinjected into fuels to raise the RVP for the winter driving system.

All fuels follow this pattern and therefore any one brand should not be effected by the changes that everyone makes.
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Michael29644
Champion Author Greenville

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Message Posted: Dec 3, 2012 8:56:47 PM

My Crown Vic runs just fine on regular unleaded Costco gas year round. Of course I live in a bit warmer climate than you.
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diesdown
Champion Author North Carolina

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Message Posted: Dec 3, 2012 8:08:49 PM

Not Costxo member.....and I will not use Sams gas either.
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cheapguy135
Champion Author New Jersey

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Message Posted: Dec 3, 2012 12:03:01 PM

Did your mechanic say what codes are present to cause the check engine light to come on? Maybe it's not fuel related. Besides, chances are that Holiday or other "like fuel" places are picking up their gas from the same terminals as Costco. The "winter additive" or cold weather vs. warm weather blend in a particular area or region changes for all fuels sold in that area, not just specific brands.

[Edited by: cheapguy135 at 12/3/2012 12:04:28 PM EST]
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kevrob1972
Champion Author Maine

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Message Posted: Dec 3, 2012 11:10:22 AM

no.
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hjl17
Champion Author Toronto

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Message Posted: Dec 3, 2012 10:55:59 AM

no
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MertieMan
Champion Author Lexington

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Message Posted: Dec 3, 2012 9:57:39 AM

Buy your gas at a regular local station and you won't have this problem.
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bluenvoy
Champion Author Nashville

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Message Posted: Dec 3, 2012 9:22:59 AM

I'm not a Costo Member.
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medic6133
Champion Author New York

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Message Posted: Dec 3, 2012 9:22:42 AM

No problems for me around New Rochelle.
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ggg452
Champion Author Manitoba

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Message Posted: Dec 3, 2012 9:22:28 AM

I still believe gas is gas...The same delivery tanker stops into three of our area gas stations...
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EdPG
Champion Author Boston

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Message Posted: Dec 3, 2012 8:58:01 AM

I run Costco gas in both cars; a 2007 & 2013 no issue.
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WEPSMAN
Champion Author South Dakota

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Message Posted: Dec 3, 2012 7:58:39 AM

No Costco here.
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jes
Champion Author Pennsylvania

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Message Posted: Dec 3, 2012 7:35:50 AM

No Costco's in my area.
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OceanArcher
Champion Author Mississippi

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Message Posted: Dec 2, 2012 8:57:33 PM

Gas blends don't appear to change any here in the deep south
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maxstar
Champion Author Chicago

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Message Posted: Dec 2, 2012 8:36:13 PM

No issues here.
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