Fuel choices

[tarhoosier]

In may region all stations have 87, 89 and 91. I went to BJ's today and the choice was 87 and 93. I have NEVER sen 93 hereabout. I checked online and the internet suggests that BJ's is not a top tier gasoline. So my question to the ether is:

Top tier 91
or
BJ's 93

Vehicle is '19 G70 2 liter, 13kmiles AT, RWD.

Or other choice.

 

[mmmmeebs]

Either should be fine. Especially if you don't flog the car daily.

 

[Slip_Angle]

Top tier 91

If your car is stock, that extra octane won't do anything. In fact, you likely will see no performance gain from 87 to 91 unless you are driving in hot weather.

 

[JEdwards]

If I were you, I would use top tier 91 octane and steer clear of the BJ's gas.

 

[EdP]

In may region all stations have 87, 89 and 91. I went to BJ's today and the choice was 87 and 93. I have NEVER sen 93 hereabout. I checked online and the internet suggests that BJ's is not a top tier gasoline. So my question to the ether is:

Top tier 91
or
BJ's 93

Vehicle is '19 G70 2 liter, 13kmiles AT, RWD.

Or other choice.

If I go to BJs for shopping top off as it is 15 cents cheaper but too far out of the way to make a special trip for is as I'd burn a gallon on the round trip. Other than the occasional trip there I stick to top tier. If I lived closer I'd use it and add Techron once in a while but that may negate some of the savings.

 

[JEdwards]

If I lived closer I'd use it and add Techron once in a while

Yeah, I wholeheartedly second this.

Direct injection engines are prone to carbon deposits on the valves. So staying with top tier (which has better detergency) is very important. But, if you have no choice but to use bad gas, or save enough money to make it compelling to do so, use an additive like Techron.

 

[Bhavie]

Yeah, I wholeheartedly second this.

Direct injection engines are prone to carbon deposits on the valves. So staying with top tier (which has better detergency) is very important. But, if you have no choice but to use bad gas, or save enough money to make it compelling to do so, use an additive like Techron.

With DI fuel never touches the back of the valves to clean them off, so the quality of fuel won't have any effect on the carbon buildup.

 

[Speeder]

With DI fuel never touches the back of the valves to clean them off, so the quality of fuel won't have any effect on the carbon buildup.

I don't think you're correct about this on the new 3.5T engine.

 

[Bhavie]

I don't think you're correct about this on the new 3.5T engine.

View attachment 39541

Well yea. I'm not talking about the 3.5. That is not a DI engine...it has dual fuel injection (DI and port injection).

The 3.5 isn't available on the G70. OP has a G70. This is the G70 sub-forum. Fuel quality has no effect on the carbon buildup for our cars.

 

[ctrcbob]

I use premium only.
90% Shell.
10% Chevron.
I use premium NOT because of the higher octane. I use it because of the extra cleaners.

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[EdP]

I use premium only.
90% Shell.
10% Chevron.
I use premium NOT because of the higher octane. I use it because of the extra cleaners.

I did find this on Google

Is Shell gas better than Chevron?

Chevron has Techron and puts in ever gallon and every grade. Shell has V- Power Nitro + but they only put it in Premium.

 

[pulsar]

Good points here. Using a top tier gas certainly doesn’t hurt anything on our DI engines. The cleaning agents also keep tops of pistons clean, or cleaner than non detergent fuels do. What’s going on at the backs of my valves, not so sure other than my oil catch cans should be at least helping there. I usually get 89 octane top tier vs 93. I’m cheap and can deal with the $.25 or $.30 extra cost for 89 octane but not the $.60 to $1.00 more for 93 octane that’s not really needed to begin with unless your track racing or really need top performance in hot weather.

 

[JEdwards]

With DI fuel never touches the back of the valves to clean them off, so the quality of fuel won't have any effect on the carbon buildup.

Ahhh, thanks for the correction. I thought that it did.

So, for a straight DI engine, it only helps with combustion chamber and injectors, but has no impact on the top side of the valves.

Mine is a GV80 so it will help with all three areas, but in your vehicle top tier helps less.

 

[bill davis]

In may region all stations have 87, 89 and 91. I went to BJ's today and the choice was 87 and 93. I have NEVER sen 93 hereabout. I checked online and the internet suggests that BJ's is not a top tier gasoline. So my question to the ether is:

Top tier 91
or
BJ's 93

Vehicle is '19 G70 2 liter, 13kmiles AT, RWD.

Or other choice.

probably won't make any difference

 

[Bhavie]

Ahhh, thanks for the correction. I thought that it did.

So, for a straight DI engine, it only helps with combustion chamber and injectors, but has no impact on the top side of the valves.

Mine is a GV80 so it will help with all three areas, but in your vehicle top tier helps less.

Yup! Unfortunately. Only way to clean them is manually or using a GDI cleaner.

Not that you need to worry. Just use top tier and toss fuel system cleaner in every 10k and you're good to go.