Which fuel should I use, 91 or 95?
I would like to know which fuel grade (premium 91 or premium 95, both are available in KSA) I should use in my car.
My car has 400000 miles.
My car has a manual transmission.
Experienced mechanics share their insights in answering this question :
Hi There,
Octane rating is the measure of a fuel’s ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating prematurely in the engine. Most gasoline vehicles with factory engines (assuming no modifications) are designed to run on 87 octane, but others are designed to use higher octane fuel. Higher octane fuels are often required or recommended for engines that use a higher compression ratio and/or use supercharging or turbocharging to force more air into the engine. Increasing pressure in the cylinder allows an engine to extract more mechanical energy from a given air/fuel mixture but requires higher octane fuel to keep the mixture from pre-detonating. In these engines, high octane fuel will improve performance and fuel economy. Using a lower octane fuel than required can cause the engine to run poorly and can damage the engine and emissions control system over time. It may also void your warranty. In older vehicles, the engine can make an audible "knocking" or "pinging" sound. Many newer vehicles can adjust the spark timing to reduce knock, but engine power and fuel economy will still suffer. As always, it is best to refer to your vehicle’s specific owner’s manual which will indicate the specific octane requirement for your vehicle’s engine model.
Octane rating is the measure of a fuel’s ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating prematurely in the engine. Most gasoline vehicles with factory engines (assuming no modifications) are designed to run on 87 octane, but others are designed to use higher octane fuel. Higher octane fuels are often required or recommended for engines that use a higher compression ratio and/or use supercharging or turbocharging to force more air into the engine. Increasing pressure in the cylinder allows an engine to extract more mechanical energy from a given air/fuel mixture but requires higher octane fuel to keep the mixture from pre-detonating. In these engines, high octane fuel will improve performance and fuel economy. Using a lower octane fuel than required can cause the engine to run poorly and can damage the engine and emissions control system over time. It may also void your warranty. In older vehicles, the engine can make an audible "knocking" or "pinging" sound. Many newer vehicles can adjust the spark timing to reduce knock, but engine power and fuel economy will still suffer. As always, it is best to refer to your vehicle’s specific owner’s manual which will indicate the specific octane requirement for your vehicle’s engine model.
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For the most part, almost all Nissan vehicles will run just fine using regular grade fuel.
Nissan`s recommendation is to use 95-octane fuel, and it says it is suitable to run on E10.
The advantage of higher octane fuel is a greater stability under pressure – it is less likely to combust in the chamber before it`s supposed to do so. Remember, the golden rule is to use the recommended octane as a minimum. While it`s always tempting to save money, if your car requires 95 octane, you must not use 91.
If, for example, your car says `premium 95`, then it is not recommended to use unleaded 91, as doing so can cause engine knocking and potentially engine failure. This isn`t guaranteed to happen of course, but you will probably experience a loss of power, acceleration and fuel economy over time.
takes is premium unleaded gasoline with a recommended octane level of 91. It is also acceptable to temporarily use a premium unleaded with an octane of 87 if you can`t find octane 91.
However it is important to remember that some Nissan vehicles require Premium Unleaded Petrol (PULP) 95 RON as the minimum recommended fuel.
Fuels such as 95 or 98 RON (octane rating number) have a higher resistance to burn which indicates higher levels of energy available for the vehicle`s engine.
Can I mix premium and unleaded gas? Yes, drivers can mix the two types of fuel. The combined gas types will result in an octane level somewhere in the middle — something the vehicle “will survive,” according to The Drive.
These octane level numbers (87, 89, 91, etc.) are a percentage of the fuel`s performance measured against pure (100%) octane. Lower octane gas burns quicker than higher octane, and so require less energy to ignite.
The fuel economy of your vehicle may also be affected. If you`re driving a car that takes 91 unleaded and you fill up with a premium 95 or 98 fuel, don`t panic as this won`t lead to any engine damage. You may just not a difference a little less cash in your wallet.
The difference between the 91 and 95 octanes is the 4% change in the octane levels. Octane 95 gasoline is more flammable and lighter than 91 gasoline. The internal combustion engine performs better with higher octane numbers. Besides quality, price is an important differentiator.
This is the recommended level for nearly all standard vehicles. High end luxury vehicles, sports cars, and other performance-based vehicles are the main culprits who require premium fuel for better performance and to reduce the risk of any gunk and junk building up and doing damage to your engine.
Is the maxima considered a high compression engine? Plenty of other brands Mercedes, BMW, Lexus, Acura etc recommend or require premium fuel for their non turbo V6`s like the Maxima. So it`s not just about turbos only. on my third max first had 280000 miles second 190000, waste of money putting in higher octane.
The Maxima SR comes with the same 3.5L V6 engine and has a power output of 300 hp. The maximum torque is 261 lb. -ft and the top speed is 135 MPH. The swift CVT allows the Nissan to accelerate from 0 to 60 MPH in just 5.9 seconds.
Why Do Vehicles Need Premium Fuel? Some vehicles use high compression or forced induction to increase performance or fuel economy. Because of the higher compression, the fuel-air mixture has an even higher probability of experiencing pre-ignition, so automaker`s prevent this by requiring premium fuel only.
The V6 is designed to run on regular and it should run just fine on regular. But that does not mean it is tuned and designed for only 87. It simply means the car has the knock resistance and monitoring, and tune tables required for the car to run good and safely on 87.
Which Type of Fuel Should I Be Using? The answer is the cheapest fuel that your car`s engine is designed for. Premium gas won`t improve your engine`s performance or produce more power if your car was designed to operate on regular octane gas.
There are racing engines in V6 configuration that require high octane fuel (running low octane fuel can ruin such an engine through excessive knocking, if you keep running it while it`s knocking badly), and there are many regular car V6 engines that aren`t picky at all, and will take whatever is available at your …
No, you don`t need premium gas . . .
The ECU will adjust the timing to compensate for the octane of gasoline you use.
The fuel filter is positioned in the line leading from the gas tank to the engine and prevents containments from getting inside the engine, which could lead to a loss in performance and potential damage to the cylinder lining.
Well, that depends on the engine. Many drivers who believe that 98 petrol is more efficient think they are saving the environment by using premium. However, the truth is that 98 petrol is only more efficient if the car engine is high-performance.
Premium gas is also often referred to as high-octane gas, thanks to an octane rating of 91 to 94. Regular gas typically has an 87-octane rating, and the 88-90 range is considered midgrade. While premium gas drives performance in certain engines, the idea that it`s more fuel efficient is a myth.
Premium gas — that is, gas with an octane rating of 91 or more — is required for some high performance and luxury vehicles. Gasoline with a high octane rating is more difficult to ignite, which helps prevent pre-ignition and knocking in high performance engines.
You can mix 87 and 89 gas. However, it`s a bad idea because the two fuels have different octane ratings. When you put them together in your car`s tank, the engine will try to adjust to the lower octane rating of 87 and could potentially cause damage.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
I have a 1981 e-350 with dual fuel tanks the p.o. added a third tank and 3 electric fuel pumps along with sepparate gauges and swi
ANSWER : The switch you are referring to is vended with the required electrical and fuel schematic (I just looked in the box) that answers your installation question. If you want an advance view, here is a link as well. Yes, you need a return line and just refer to the aforementioned link. If you are retrofitting back to OEM, I strongly encourage you to buy the original Factory Service Manual (FSM). There are lots of details attending this system and obviously it is difficult to recount it all here. The FSM will make your life much easier and you can then make sure your installation is perfect. Alternatively, YourMechanic can dispatch a certified mechanic and perform the whole retrofit and check out if you desire. Just request and schedule a generic service such as fuel pump service and the mechanic will come to your location and estimate the parts and labor required. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.
Read Full Q/A … : Which fuel should I use, 91 or 95?
Which fuel should I use, 91 or 95?
ANSWER : Hi There,
Octane rating is the measure of a fuel’s ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating prematurely in the engine. Most gasoline vehicles with factory engines (assuming no modifications) are designed to run on 87 octane, but others are designed to use higher octane fuel. Higher octane fuels are often required or recommended for engines that use a higher compression ratio and/or use supercharging or turbocharging to force more air into the engine. Increasing pressure in the cylinder allows an engine to extract more mechanical energy from a given air/fuel mixture but requires higher octane fuel to keep the mixture from pre-detonating. In these engines, high octane fuel will improve performance and fuel economy. Using a lower octane fuel than required can cause the engine to run poorly and can damage the engine and emissions control system over time. It may also void your warranty. In older vehicles, the engine can make an audible "knocking" or "pinging" sound. Many newer vehicles can adjust the spark timing to reduce knock, but engine power and fuel economy will still suffer. As always, it is best to refer to your vehicle’s specific owner’s manual which will indicate the specific octane requirement for your vehicle’s engine model.
Octane rating is the measure of a fuel’s ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating prematurely in the engine. Most gasoline vehicles with factory engines (assuming no modifications) are designed to run on 87 octane, but others are designed to use higher octane fuel. Higher octane fuels are often required or recommended for engines that use a higher compression ratio and/or use supercharging or turbocharging to force more air into the engine. Increasing pressure in the cylinder allows an engine to extract more mechanical energy from a given air/fuel mixture but requires higher octane fuel to keep the mixture from pre-detonating. In these engines, high octane fuel will improve performance and fuel economy. Using a lower octane fuel than required can cause the engine to run poorly and can damage the engine and emissions control system over time. It may also void your warranty. In older vehicles, the engine can make an audible "knocking" or "pinging" sound. Many newer vehicles can adjust the spark timing to reduce knock, but engine power and fuel economy will still suffer. As always, it is best to refer to your vehicle’s specific owner’s manual which will indicate the specific octane requirement for your vehicle’s engine model.
Read Full Q/A … : Which fuel should I use, 91 or 95?
Can I use Primium 91 petrol for Pajero in Kuwait climate?? is there any problem for if Use this instead of Super 95?
ANSWER : Hi there:
As a United States based online mechanic service, we’re not that aware of the different climate changes in Kuwait. However, in general, when you have extreme heat, keeping your fuel consistent is very important for overall performance and engine efficiency. A change of fuel from 95 to 91 octane is a rather large jump; so you might want to seek advice from a local mechanic for your application.
Read Full Q/A … : Which fuel should I use, 91 or 95?
Fuel pressure
ANSWER : Hello,
You may want to try checking the fuel pump relay. The relay wires should have ground on two wires, power on one wire and switched power on another wire. To activate the fuel pump your ECU actually connects one of the ground wires to complete the circuit and send power to the fuel pump. If the wires all have power running through them, then it is likely you have a faulty relay. The wire coming from the fuel pump is the other ground wire. I would recommend having an expert from YourMechanic come to your location to diagnose your wiring as this can be very difficult and time consuming without the proper wiring diagram.
You may want to try checking the fuel pump relay. The relay wires should have ground on two wires, power on one wire and switched power on another wire. To activate the fuel pump your ECU actually connects one of the ground wires to complete the circuit and send power to the fuel pump. If the wires all have power running through them, then it is likely you have a faulty relay. The wire coming from the fuel pump is the other ground wire. I would recommend having an expert from YourMechanic come to your location to diagnose your wiring as this can be very difficult and time consuming without the proper wiring diagram.
Read Full Q/A … : Which fuel should I use, 91 or 95?
Using E-15 fuel in my car do I need to use regular unleaded fuel maybe once in awhile or is it safe to continue to use the E-15?
ANSWER : E-15 is shorthand for gasoline blended with 15% Ethanol which is a fairly corrosive material which can cause damage to rubber parts and other critical parts over time. Ethanol also attracts and bonds with water from the air, and that water can separate out inside the tank due to phase separation. If your vehicle sits for long periods between use, the moisture settles to the bottom of the tank and can potentially clog in-tank pumps and filters. Damage is also possible in fuel lines, injectors, seals, gaskets, and valve seats as well as carburetors on older engines.
The main issue with respect to E-15 in many cases is whether or not the car will be covered under warranty from damage caused by using this product. GM and Ford have certified their own cars starting with 2012 (GM) and 2013 (Ford) to be compatible with E-15 and so some of the newer cars may not have any trouble with this.
I would not recommend using this fuel on longer drives where the chances of burning through an entire tank relatively quickly are greater. This may lessen the chance of excess E-15 fuel sitting in the bottom of your tank for longer periods of time where it may be prone to causing damage as outlined above.
If you run into any issues, feel free to contact YourMechanic, as one of our mobile technicians can come to your home or office to service your vehicle.
Read Full Q/A … : Which fuel should I use, 91 or 95?
Just replaced my fuel pump but its not getting any power tested fuel pump relay and fuel fuse both good tested the wires all good.
ANSWER : You need to look at the theft light on dash to make sure it comes on and goes off when you turn the key to the on position. If light comes on and stays on then your theft system is causing the fuel pump to not be engaged. I recommend you check the theft system and then scan the computer for theft system codes. You may need to reprogram the keys to work or you have an bad sensor for the ignition key in the steering column.
Read Full Q/A … : Which fuel should I use, 91 or 95?
My car is Nissan Premiere and it uses Elecetric Carbueretor but I notice anytime I buy fuel it burn faster, I mean the fuel use to
ANSWER : If you are noticing a decrease in fuel mileage, there are a few things that you can check. The first thing I would recommend checking would be the air filter. If the air filter is dirty, this will cause the engine to use more effort during running and therefore decreases fuel economy. I would also check the level and condition of the oil. If the oil is black or low, the engine will also use more fuel due to extra effort required. Finally, I would recommend checking the tire pressures. The tire pressure going low can cause a major difference in fuel economy.
Read Full Q/A … : Which fuel should I use, 91 or 95?
I have a truck that won’t run and is not getting gas to the engine. Fuel pump is running, have a new filter and new fuel pressure
ANSWER : Hi There,
It sounds like you may have a clogged fuel injector or potentially a faulty injector that is fried internally. I would suggest testing them if you have access to a multi meter. Disconnect the injector from the electrical connector and set your multi meter to Ohms mode and measure the resistance of the injector. After testing all injectors, compare the resistance. They should be the same or very close. If they are not, they will likely need to be replaced.
It sounds like you may have a clogged fuel injector or potentially a faulty injector that is fried internally. I would suggest testing them if you have access to a multi meter. Disconnect the injector from the electrical connector and set your multi meter to Ohms mode and measure the resistance of the injector. After testing all injectors, compare the resistance. They should be the same or very close. If they are not, they will likely need to be replaced.
Read Full Q/A … : Which fuel should I use, 91 or 95?
