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AAA study finds drastic differences In gasoline quality.

xxxHolic 31,530 5,566 July 7, 2016 at 10:38 PM

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#2
Nothing really new here. Personally I tend to buy Shell fuel at the grade my manufacture recommend (non turbo or high compression engine).

The more interesting info is for Gasoline Direct Injection engines https://en.wikipedia.org/wiki/Gas..._injection. Unlike a more traditional port injected engine where the fuel and air mix before flowing in to the cylinders thus washing over the valves helping to minimize deposits, GDI engines don't do this. Instead Gasoline is injected into the cylinder, skipping the cleaning it can do over the valve tops. People are seeing problems with this industry wide and the traditional methods to remove them don't work with a GDI such as adding extra fuel additives in your tank like Techron. etc.
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#3
I've never even seen the "Top Tier" logo at a gas station.
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#4
Quote from brbubba View Post :
I've never even seen the "Top Tier" logo at a gas station.
I was surprised to see the trademark symbol after "Top Tier"
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#5
Quote from LiquidRetro View Post :
The more interesting info is for Gasoline Direct Injection engines https://en.wikipedia.org/wiki/Gas..._injection. Unlike a more traditional port injected engine where the fuel and air mix before flowing in to the cylinders thus washing over the valves helping to minimize deposits, GDI engines don't do this. Instead Gasoline is injected into the cylinder, skipping the cleaning it can do over the valve tops. People are seeing problems with this industry wide and the traditional methods to remove them don't work with a GDI such as adding extra fuel additives in your tank like Techron. etc.
What's the easiest effective way to clean the valves in a direct injection engine? Companies like CRC sell products that are sprayed into the intake while the engine runs at 2,000 RPM, but I can't find any proof that they do any good. BG has a video showing how to use their cleaner, but it requires:
  1. removing all the sparkplugs
  2. removing all the hardware attached to the intake manifold
  3. rotating the engine so the cylinder's intake valve is closed
  4. pouring 1 oz of cleaning fluid
  5. scrubbing the valve after letting it soak for 15 minutes
  6. scrubbing the valve again after another 15 minutes
  7. sucking out the cleaning fluid
  8. pouring in a different type of fluid
  9. sucking it out
  10. repeating steps 3-9 for each other cylinder
  11. reinstalling the intake parts
  12. reinstalling spark plugs
  13. changing the engine oil

It's that simple.
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#6
Quote from larrymoencurly View Post :
What's the easiest effective way to clean the valves in a direct injection engine? Companies like CRC sell products that are sprayed into the intake while the engine runs at 2,000 RPM, but I can't find any proof that they do any good. BG has a video showing how to use their cleaner, but it requires:
  1. removing all the sparkplugs
  2. removing all the hardware attached to the intake manifold
  3. rotating the engine so the cylinder's intake valve is closed
  4. pouring 1 oz of cleaning fluid
  5. scrubbing the valve after letting it soak for 15 minutes
  6. scrubbing the valve again after another 15 minutes
  7. sucking out the cleaning fluid
  8. pouring in a different type of fluid
  9. sucking it out
  10. repeating steps 3-9 for each other cylinder
  11. reinstalling the intake parts
  12. reinstalling spark plugs
  13. changing the engine oil

It's that simple.
Never used it but heard about CRC intake cleaner.
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#7
Quote from PiratePenguin View Post :
Never used it but heard about CRC intake cleaner.
I looked at the YouTube videos about CRC intake cleaner, and they all say how wonderful it is, but none show before & after photos. So I'm suspicious, considering how ChrisFix found that some combustion chamber cleaners for other engines showed hardly any visible results.
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#8
Since there isn't any ethanol free gasoline available near me, I use premium Shell in my 1.4l turbo Dodge Dart. Unfortunately that article doesn't mention the price gap with premium. Regular may average a 3 cent difference but premium has about a 40 cent difference. Shell Premium is about 78 cents a gallon more than regular around here while lower-tier gas price has a difference of about 40 cents.
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#9
I have noticed that I tend to get engine knock from the gas at some stations vs others. The company itself could be the issue but the stations can be at fault as well.

Sediment and water in the underground tank can cause issues as well as filter problems on the pump themselves.
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#10
Quote from Pedantyc View Post :
I have noticed that I tend to get engine knock from the gas at some stations vs others. The company itself could be the issue but the stations can be at fault as well.

Sediment and water in the underground tank can cause issues as well as filter problems on the pump themselves.

To say nothing about the hose they use to water it down lol.
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#11
figures. you get what you pay for.
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#12
Quote from marg_fan View Post :
Since there isn't any ethanol free gasoline available near me, I use premium Shell in my 1.4l turbo Dodge Dart. Unfortunately that article doesn't mention the price gap with premium. Regular may average a 3 cent difference but premium has about a 40 cent difference. Shell Premium is about 78 cents a gallon more than regular around here while lower-tier gas price has a difference of about 40 cents.
Depending on your area there are a few reasons for this big jump. Most likely it's the blend. Some Premium has ethanol in it actually, others don't. So the completely free ethanol premium tends to cost a lot more. Season of the year can matter here too as sometimes we import fuel from europe to burn here and thats more expensive.

BTW if you read your manual your engine can probably use ethanol just fine (an E10 blend) as long as you meet the octane rating. Very few new cars mandate ethanol free fuel.
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#13
Quote from LiquidRetro View Post :
Depending on your area there are a few reasons for this big jump. Most likely it's the blend. Some Premium has ethanol in it actually, others don't. So the completely free ethanol premium tends to cost a lot more. Season of the year can matter here too as sometimes we import fuel from europe to burn here and thats more expensive.

BTW if you read your manual your engine can probably use ethanol just fine (an E10 blend) as long as you meet the octane rating. Very few new cars mandate ethanol free fuel.
As far as I know, I am using an E10 blend in my car. I haven't looked at the pump closely enough. Shell raised the price gap when they introduced V-Power Nitro+ last year or early this year. That made it more expensive than the ethanol free gas I can get in a town about 45 miles away from home. I get around 3 or 4 more mpg using ethanol free gas. That and it supposedly burns cleaner is why I wish I could find ethanol free gas closer to home.

My car manual says premium (91 octane or higher) is highly recommended but I can use regular gasoline. Like that is going to happen. laugh out loud
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