[DanG]

Originally Posted by Berzerker

Yeah I mean, if that's legitimately your cheapest option, but there's other non-big brand stations that are also Top Tier.

https://www.toptiergas.com/gasoline-brands/

The only other stations hear me are Mobile and 76. Both are more expensive than Chevron. There are no independent stations except Safeway. I don’t trust Safeway gas.

[FrankMstein]

Originally Posted by M2siast

How?

No aux vapor collection system. If you just drive it without the oil getting to operating temp (to burn off the water vapor) you will get build up on the valves from the water and oil vapor from the crankcase.

[FrankMstein]

Originally Posted by Berzerker

Yeah I mean, if that's legitimately your cheapest option, but there's other non-big brand stations that are also Top Tier.

https://www.toptiergas.com/gasoline-brands/

Where did we see that earlier...

I was using QT, and it was good, but now have the shell app and get .5-.35 off. I plan around those locations as they don't recognise Circle K. I wish I could find actual DATA!!

[F32Fleet]

Originally Posted by FrankMstein

I have looked in the interwebs and still can't find what fuel is better than others with actual DATA. It can vary slightly from Exxon to Exxon (shell to Shell), definitely state to state. I have heard the same old tired story of "it all comes from the same depo/refinery so it's all the same" BS. There are a lot of refineries around the US and each brand has their own additives they request to be in the "same fuel from the refinery" which does a number of things from cleaning, octane improvers, mileage (ethanol), lubrication, stabilizers, and a lot of others. There is North and South blended fuel for climate and ACN91. It's all confusing. Shell, Chevron, Exxon/Mobil, Sinclair, and Costco are commonly known as the top five. But some Cosco doesn't have 93. One of the big surprises this year was that BP FELL OUT of TT. IF your car has a flash tune in it, E10 is what you want.

Surprisingly Ohio, Nebraska, and Alaska do not have state testing for fuel. Kentucky was one in the past and it was a dumping ground near the borders for fuel from neighboring states that did not make the grade.

I have been a long time user of Shell because it makes a difference and others say the same. Shell is widely known as the best fuel but there are others that were just about as good.

https://www.toptiergas.com/gasoline-brands/

Nor will you ever find it because the information is proprietary. However there are differences between top-tier vs federal minimum and differences in octane. Higher octane gets more additive. Top tier gets more additive across the board.

[F32Fleet]

Originally Posted by shawnhayes

These are direct injection cars. Without an adequate detergent package and no oil vapor collection system, the valves get dirty over time on the backsides and stems. Can bomb the valve train.

Shawn

The quality of the gasoline has no impact on build up at the valves because DI engines do not have fuel washing over the valves.

Now some engines have PFI w/DI inwhich you'd be correct.

However, injectors tips need to remain carbon free. Carbon can build up on shut down because fuel at the hot injector tips just bakes.

[Berzerker]

Originally Posted by FrankMstein

Where did we see that earlier...

I was using QT, and it was good, but now have the shell app and get .5-.35 off. I plan around those locations as they don't recognise Circle K. I wish I could find actual DATA!!

I don't see how you get .35c off without doing their weird "pay to get more off" promotional things. QT is consistently more than .35c off for premium than every other big brand around me anyway.

[Berzerker]

Originally Posted by F32Fleet

The quality of the gasoline has no impact on build up at the valves because DI engines do not have fuel washing over the valves.

Now some engines have PFI w/DI inwhich you'd be correct.

However, injectors tips need to remain carbon free. Carbon can build up on shut down because fuel at the hot injector tips just bakes.

The buildup can happen on the intake valves.

Originally Posted by M2siast

What's that got to do with the gas you chose?

It's literally how the top tier gas certification works. The additives prevent things like he described from happening.

[F32Fleet]

Originally Posted by SickStroke6.0

How much are you guys driving where $4-$6 matters? At most, I'm filling up 4 times a month. ~$200-$300 a year is worth the peace of mind.

Shell fuel is all I run, and it's not because BMW says so.

Costco is 10 min away. I save almost $9/tank compared to Shell V-Power 93.

[F32Fleet]

Originally Posted by Berzerker

It's literally how the top tier gas certification works. The additives prevent things like he described from happening.

Wth DI there's no fuel wash to keep the valves clean.

PFI allows fuel to wash over the valves which is why they stay clean.

[shawnhayes]

Originally Posted by M2siast

How?

https://www.vehicleservicepros.com/c...in-gdi-engines

Despite the IDEA that fuel not making it into the crankcase, so it can't help with carbon buildup on GDI engines, both Honda and Volkswagen say BS. Audi outright says the garbage fuel standards we have in the U.S. are directly responsible for all the trouble we have with carbon deposits.

Adequate detergent packages from Top Tier gasoline in the U.S. helps SOME with deposits by going through the crankcase and being volatile in the PCV system. Having done multiple oil analyses on my cars in the past, there is a significant amount of gasoline in many oil crankcases - dependant on car and engine. And if it's crap, of poor quality, it contributes to an oil vapor that can be more problematic, no matter how good your oil is. Cause if you put skanky convenience store gas in your tank into your $100,000 car with $20 per quart oil in it, you get skanky gas into your oil vapor floating around your crankcase.

Shawn

[Berzerker]

Originally Posted by F32Fleet

Wth DI there's no fuel wash to keep the valves clean.

PFI allows fuel to wash over the valves which is why they stay clean.

There's no wash on the valves, but the valves are still involved in the injected fuel/air mixture, which makes the valves harder to have deposits removed because of the fact there's no fuel wash. That's why Top Tier gas is more important. You don't get the deposits in the first place so there's no need to be concerned about deposits.

[shawnhayes]

Originally Posted by F32Fleet

The quality of the gasoline has no impact on build up at the valves because DI engines do not have fuel washing over the valves.

Now some engines have PFI w/DI inwhich you'd be correct.

However, injectors tips need to remain carbon free. Carbon can build up on shut down because fuel at the hot injector tips just bakes.

As in the above message, Audi and VW say this is not the case. Other manufacturers have avoided DI in the U.S. due to the garbage quality of gasoline we have here.

Do an oil analysis of your own oil and tell me it's 0% gasoline contamination. Gasoline contamination contributes to oil vapor in the crankcase, directly affecting valve stem deposits.

Shawn

[hellokitty]

I run Stabil Marine in all my cars from E10 to full E85.

It has nice dose of PEA fuel system cleaners along with corrosion inhibitors.

This helps slow fuel oxidation as well as clean injectors.

[FrankMstein]

Originally Posted by shawnhayes

As in the above message, Audi and VW say this is not the case. Other manufacturers have avoided DI in the U.S. due to the garbage quality of gasoline we have here.

Do an oil analysis of your own oil and tell me it's 0% gasoline contamination. Gasoline contamination contributes to oil vapor in the crankcase, directly affecting valve stem deposits.

Shawn

Whiiiiich is why I made the vapor separator comment earlier. Am I in the conversation? I guess I'm out...

[FrankMstein]

Originally Posted by hellokitty

I run Stabil Marine in all my cars from E10 to full E85.

It has nice dose of PEA fuel system cleaners along with corrosion inhibitors.

This helps slow fuel oxidation as well as clean injectors.

Mmmmm how often?

[shawnhayes]

Originally Posted by FrankMstein

Whiiiiich is why I made the vapor separator comment earlier. Am I in the conversation? I guess I'm out...

I just made my direct response. Yours was a one liner. Not incorrect, just wanted to do more.

Shawn

[hellokitty]

Originally Posted by FrankMstein

Mmmmm how often?

Every tank of gas based on their recommendations.

Stabil Marine only takes 1 oz to treat 10 gallons, so it's somewhat cost effective since you only need to use 1.5oz to treat a full tank.

[F32Fleet]

Originally Posted by Berzerker

There's no wash on the valves, but the valves are still involved in the injected fuel/air mixture, which makes the valves harder to have deposits removed because of the fact there's no fuel wash. That's why Top Tier gas is more important. You don't get the deposits in the first place so there's no need to be concerned about deposits.

Deposits are due to oil vapors and combustion by-products via blow-by.

[FrankMstein]

Originally Posted by hellokitty

Every tank of gas based on their recommendations.

Stabil Marine only takes 1 oz to treat 10 gallons, so it's somewhat cost effective since you only need to use 1.5oz to treat a full tank.

Was reading that...

[FrankMstein]

Originally Posted by hellokitty

Every tank of gas based on their recommendations.

Stabil Marine only takes 1 oz to treat 10 gallons, so it's somewhat cost effective since you only need to use 1.5oz to treat a full tank.

Since this is an ethanol treatment, it will not extend the OCI or plug life will it?

[F32Fleet]

Originally Posted by shawnhayes

As in the above message, Audi and VW say this is not the case. Other manufacturers have avoided DI in the U.S. due to the garbage quality of gasoline we have here.

Do an oil analysis of your own oil and tell me it's 0% gasoline contamination. Gasoline contamination contributes to oil vapor in the crankcase, directly affecting valve stem deposits.

Shawn

VWUSA is making stuff up because they for years opted to not sell US cars with the dual PFI/DI injection system that is used in the European market.


Top tier gas has nothing to do with fuel solution nor will it prevent IVD. Choice of oil and the PCV have an impact.

[FrankMstein]

Originally Posted by F32Fleet

VWUSA is making stuff up because they for years opted to not sell US cars with the dual PFI/DI injection system that is used in the European market.


Top tier gas has nothing to do with fuel solution nor will it prevent IVD. Choice of oil and the PCV have an impact.

Yes, plus is you get the oil up to operating temp on >60% of your drives IVD is not going to be much of a problem. Also drive it like you stole it helps too!