Costco Gas - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 11-12-2009, 10:14 PM Thread Starter
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Costco Gas

Hi I was wondering if Costco gas is a good brand of gas for my 1997 Mercedes S320. I just want to make sure that it isn't bad for my car thanks
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post #2 of 12 (permalink) Old 11-12-2009, 10:31 PM
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In theory it should be okay. But you could end up like my mom when she had to pay for some expensive repairs for her Jag because the workshop said the previous owner "must have used cheap gas".
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post #3 of 12 (permalink) Old 11-12-2009, 10:37 PM
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Considering the amount of "turn over" that their pumps get, it's probably a better mix of fuel than a station that doesn't do as much business, allowing for exposure to the atmosphere, condensation and other possible contamination issues.

What's "missing" from Costco fuels, compared to premium-name brands are the cocktails of detergents, which you can routinely add yourself. I believe most Costcos sell Chevron Techron additive in the auto section.
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post #4 of 12 (permalink) Old 11-12-2009, 10:53 PM
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Run Costco gas in lots of vehicles including my E420, when it's handy, and have never had a problem or noticed any difference in performance or mileage. Now I wish they also had Diesel, at least in my area only regular and premium, no Diesel.

Personally, I think many of the "must have used cheap gas" reasons from mechanics is because they don't know the real reason for a failure and want to tell the customer something.

You probably run a bigger risk of problems when you buy gas from a small station with low turnover and end up with water and/or dirt in the fuel.


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post #5 of 12 (permalink) Old 11-13-2009, 07:58 AM
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Personally, I think many of the "must have used cheap gas" reasons from mechanics is because they don't know the real reason for a failure and want to tell the customer something.
Any tech worth his salt can tell detonation problems. It's as plain as the nose on your face.

To the OP...I've used Costco and Sam's gas in my supercharged Cobra for thousands of miles with no issues or detonation. I do however have my own fuel injector cleaning equipment that I use to keep things operating the way they should be.
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post #6 of 12 (permalink) Old 11-13-2009, 09:26 AM
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I've been buying the cheapest gas I can find my whole life and never had engine problem.
Our original ML320 running 12-th year with about 120k on it is the most perfect vehicle I heard about with $150 in repairs during last 11 years.
Costco generally is selling the highest quality stuff. Their relabeled toilet paper is the highest brand on the market. Would expect the same from gas, but it would be worth calling them and checking.
I will just remind that there is no such thing as "brand gasoline" .
All the gasoline sold in the area is coming from the same closest refinery meaning lot of Chevron gas come from ARCO refineries. Suppose the Chevron additives are added on the tanker, but how can you confirm that?

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post #7 of 12 (permalink) Old 11-13-2009, 09:29 AM
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Costco gas is the same as everyone else's gas, what is different is the additives that Costco uses to help keep you engine clean. Personally, I would not uses it unless you have no choice.


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post #8 of 12 (permalink) Old 11-13-2009, 10:00 AM
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I will just remind that there is no such thing as "brand gasoline" .

All the gasoline sold in the area is coming from the same closest refinery meaning lot of Chevron gas come from ARCO refineries. Suppose the Chevron additives are added on the tanker, but how can you confirm that?
Somewhat incorrect. All commercial gasoline starts out as "base" fuel at a refinery; each "brand" then adds their proprietary cocktail of additives (detergents) to the base fuel prior to delivery.
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post #9 of 12 (permalink) Old 11-13-2009, 10:32 AM
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What I read is that non service-station gasoline is added alcohol to reach the octane value. So who really knows...

You really wish to know for sure, take a sample and send it to a lab to analyze.
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post #10 of 12 (permalink) Old 11-13-2009, 10:43 AM
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Somewhat incorrect. All commercial gasoline starts out as "base" fuel at a refinery; each "brand" then adds their proprietary cocktail of additives (detergents) to the base fuel prior to delivery.
Correct.

And for anyone who didnt know, odor and color is also added to the base

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