DarkJediKnight
Member
Can someone explain to me the purpose of 89 octane? It seems your common gasoline car runs on either 87 or 91. Why does 89 exist? Is it an in-between gas for premium users? Makes 87 users drive smoother? I don't know.
Can someone explain to me the purpose of 89 octane? It seems your common gasoline car runs on either 87 or 91. Why does 89 exist? Is it an in-between gas for premium users? Makes 87 users drive smoother? I don't know.
The fuck? You use different octanes in the US? 95/98 over here in EU land.
Octane preference isn't as set as that. A car that ask for premium will run on a lower octane gas but the ECU will retard timing to prevent engine knock. Most of the time(100% of the time) this means less power and worse gas mileage. Also 91 isn't always available in some areas and 89 is a close substitute.
I've always been told that they are measured differently. Let me look up a source.
Edit: https://youtu.be/cfhTTuxF6Mk
The fuck? You use different octanes in the US? 95/98 over here in EU land.
91/E10(ethanol)/95/98 here in AUThe fuck? You use different octanes in the US? 95/98 over here in EU land.
My car asks for 91 or higher. I put 89 in it occasionally and it seems fine. But sometimes I go half 89 and half 93 if there isn't any 91. Lol.
Why not just use 93?Can someone explain if I'm correct here please. My car is recommended for 91 octane. What I like to do is put half 93 and half 89 octane. Does that equal 91 octane? Does octane work that way that you can add them and divide the rating by two?
Can someone explain if I'm correct here please. My car is recommended for 91 octane. What I like to do is put half 93 and half 89 octane. Does that equal 91 octane? Does octane work that way that you can add them and divide the rating by two?
Why not just use 93?
Can someone explain if I'm correct here please. My car is recommended for 91 octane. What I like to do is put half 93 and half 89 octane. Does that equal 91 octane? Does octane work that way that you can add them and divide the rating by two?
91/E10(ethanol)/95/98 here in AU
I'm so confused - I assumed that it was either Petroleum or Diesel for a car
91/E10(ethanol)/95/98 here in AU
Isn't this stuff just snake oil unless you're driving a really high-end car?
Basically. Unless your car specifically says it requires higher octane using does nothing.Isn't this stuff just snake oil unless you're driving a really high-end car?
Because I'm a cheap shit. I need to get me one of these pumps:
Isn't this stuff just snake oil unless you're driving a really high-end car?
Isn't this stuff just snake oil unless you're driving a really high-end car?
It's based on engine design. Some cars that are sub-20k still require premium, but for cars that don't you'll see no benefit using higher octanes.
Like luxury cars that will run you $100k or more.Define high-end.
Isn't this stuff just snake oil unless you're driving a really high-end car?
Just when I see the guy at Costco putting high octane fuel in entry-level BMW or Audi or whatever it makes me roll my eyes a little. It's always seemed like an idiot tax to me.
Those cars will almost certainly perform best with the highest octane fuel and probably require it.
Like luxury cars that will run you $100k or more.
"High end" I guess - I'm not really talking about hypercars or anything over $500k, in which it's obvious why you'd use a high octane fuel.
Just when I see the guy at Costco putting high octane fuel in entry-level BMW or Audi or whatever it makes me roll my eyes a little. It's always seemed like an idiot tax to me.
This isnt strictly true. Many cars can adjust timing if you use higher octane and performance improves.
I had a 3 series and putting in 89 would give me worst mileage that completely cancelled out the cost savings in getting 89 over 91. Made the car noticeably slower too.^ Interesting... I'm curious why I know so little about this kind of thing. I love cars and I love mine, but I've never even checked the manual to see what kind of gas it wants. I have always bought the cheap shit (even for my motorcycle) and it's always worked just fine.
Like luxury cars that will run you $100k or more.
"High end" I guess - I'm not really talking about hypercars or anything over $500k, in which it's obvious why you'd use a high octane fuel.
Just when I see the guy at Costco putting high octane fuel in entry-level BMW or Audi or whatever it makes me roll my eyes a little. It's always seemed like an idiot tax to me.
^ Interesting... I'm curious why I know so little about this kind of thing. I love cars and I love mine, but I've never even checked the manual to see what kind of gas it wants. I have always bought the cheap shit (even for my motorcycle) and it's always worked just fine.
Like luxury cars that will run you $100k or more.
"High end" I guess - I'm not really talking about hypercars or anything over $500k, in which it's obvious why you'd use a high octane fuel.
Just when I see the guy at Costco putting high octane fuel in entry-level BMW or Audi or whatever it makes me roll my eyes a little. It's always seemed like an idiot tax to me.
They don't need to be high end. My 350z only takes 91 and it's not an expensive car it's probably just because it's a sports car. You should really check your manual or gas cap and make sure you're using the right mix. Rather have to pay a couple more cents a gallon then have engine trouble later down the road to save money. Always pumping 91 I kinda don't even look at pump prices since I'll almost always be paying around $3.25+ a gallon. Also lol at the part where you love cars and your car but don't even know what it's supposed to run on. I'm guessing you also don't change your own oil or brakes....^ Interesting... I'm curious why I know so little about this kind of thing. I love cars and I love mine, but I've never even checked the manual to see what kind of gas it wants. I have always bought the cheap shit (even for my motorcycle) and it's always worked just fine.
Like luxury cars that will run you $100k or more.
"High end" I guess - I'm not really talking about hypercars or anything over $500k, in which it's obvious why you'd use a high octane fuel.
Just when I see the guy at Costco putting high octane fuel in entry-level BMW or Audi or whatever it makes me roll my eyes a little. It's always seemed like an idiot tax to me.
They don't need to be high end. My 350z only takes 91 and it's not an expensive car it's probably just because it's a sports car. You should really check your manual or gas cap and make sure you're using the right mix. Rather have to pay a couple more cents a gallon then have engine trouble later down the road to save money. Always pumping 91 I kinda don't even look at pump prices since I'll almost always be paying around $3.25+ a gallon.
^ Interesting... I'm curious why I know so little about this kind of thing. I love cars and I love mine, but I've never even checked the manual to see what kind of gas it wants. I have always bought the cheap shit (even for my motorcycle) and it's always worked just fine.
Like luxury cars that will run you $100k or more.
"High end" I guess - I'm not really talking about hypercars or anything over $500k, in which it's obvious why you'd use a high octane fuel.
Just when I see the guy at Costco putting high octane fuel in entry-level BMW or Audi or whatever it makes me roll my eyes a little. It's always seemed like an idiot tax to me.
^ Interesting... I'm curious why I know so little about this kind of thing. I love cars and I love mine, but I've never even checked the manual to see what kind of gas it wants. I have always bought the cheap shit (even for my motorcycle) and it's always worked just fine.
Like luxury cars that will run you $100k or more.
"High end" I guess - I'm not really talking about hypercars or anything over $500k, in which it's obvious why you'd use a high octane fuel.
Just when I see the guy at Costco putting high octane fuel in entry-level BMW or Audi or whatever it makes me roll my eyes a little. It's always seemed like an idiot tax to me.
They don't need to be high end. My 350z only takes 91 and it's not an expensive car it's probably just because it's a sports car. You should really check your manual or gas cap and make sure you're using the right mix. Rather have to pay a couple more cents a gallon then have engine trouble later down the road to save money. Always pumping 91 I kinda don't even look at pump prices since I'll almost always be paying around $3.25+ a gallon.
I think there's even Diesel & Diesel Super now lolYep. I usually run 95 minimum in any car I own and 98 in my bike.
The only issue I've experienced is that 91 fuel is generally less refined here. Almost every car I see at work that needs a new fuel filter or pump (before the expected replacement date) was run exlusively on 91 and the parts are gunked to all shit.
Also, never run a car or bike under the quarter tank mark if you can help it, people.
Petrol/diesel/LPG are standard types of fuel. Usually, petrol come in variants with different octane levels. I've never really seen diesel have a non-standard variant. Never owned an LPG vehicle.
Ya I've used 98 in everything for yrs now I even find my whipper snipper runs smoother on itYeah, though my local station has changed to 91e/94e/98 for some reason. Means I have to use 98 in my wife's car and my fucking mower because neither will take ethanol.
And why bother looking at the price? Are you not going to drive your car? I mean you might decide not to go on a long trip, but are you going to stop going to work?
People seriously over-react to variations in fuel price. I'm not saying you don't notice an increase of $2 to $3 per gallon, but price hunting from station to station for a five cent difference is asinine.
And why bother looking at the price? Are you not going to drive your car? I mean you might decide not to go on a long trip, but are you going to stop going to work?
People seriously over-react to variations in fuel price. I'm not saying you don't notice an increase of $2 to $3 per gallon, but price hunting from station to station for a five cent difference is asinine.
Basically. Unless your car specifically says it requires higher octane using does nothing.
Yeah it has nothing to do with the value of the car and if you're going to judge people for using it when you don't know why it's needed or not is rather ignorant.
My car says to use premium and as far as I can tell it makes no difference to either performance or fuel consumption
What happens if you put a lower octane than your car requires?
In short, MAYBE nothing. This one is kind of a big risk. The stack exchange article says that a modern knock sensor will correct for lower octane fuel. This is true, but only in steady state conditions; like cruising down the road, or steady uphill, etc. Transient conditions are where the problems lie. Since it does take time to analyze the knock sensor signal, fast changes in engine load or speed, are difficult to prevent knock. Every automaker is going to be different in this regard, since the ability to analyze this knock quickly depends on the skill of the programmers and calibrators and even the speed of the PCM processor. So, if you put in a lower octane fuel, and then go drive your car hard, press the accelerator quickly, it is possible to experience heavy knock, and possible engine damage. I will say, it is unlikely to actually happen in cars produced in the last few years, but you are certainly exposing your engine to the possibility. ALWAYS, ALWAYS, ALWAYS use the fuel recommended in the owners manual of your car, or any signs on the fuel door or cap. When engineers say to use a certain fuel, we have good reasons for doing so.
Shit ads up. Fuck that. I mean there two two gas stations next to each other. 50c difference in price. I don't know how that sunoco stays open. But I absolutely would go somewhere else for 5c cheaper gas. Add that up over a year.