87 octane is fine, but it will not hurt if you want to use a different octane...
For one tank of gas, probably not. However, over the long term the engine may wear more quickly. High compression engines are designed for high octane gas.
It would only hurt if the car required 89 octane or 92 octane and you went to a lesser octane. Those cars are engineered to run on a higher octane. A car engineered for the lower 87 octane might actually see some performance improvement by going to a higher octane once or twice, because the higher octane will help to clean the injectors a "little". Not much though. Over all there is no real significance to using the higher octane. The higher the octane level, the "richer" or "heavier" the fuel is. So if the car is not manufactured for the higher octane, you will eventually cause carbon build up at a faster rate than normal.
High octane gas will not hurt your Subaru's motor but will offer little to no advantage over the regular grade gas that the manufacturure recommends. High octane fuels resist detonation better then regular octane fuel, this is required in high performance high compression engines like the Suburu STI turbo motor, your car has the regular compression non-turbo motor so save your money and just get the regular grades. Detonation- When the fuel ignites and explodes before the spark plug fires, causes knocking sounds and can hurt the motor. Compression- the squeeze force in the combustion chamber, the higher the compression the greater the heat and the higher the risk that the fuel will detonate unless a higher octane fuel is used. Diesel engines use high compression alone to ignite the fuel mixture hence they have no need for spark plugs but require diesel fuel rather than gasoline.
No, it won't hurt your engine. There are computers now that can predict when to fire a spark plug to reduce ping. It is not a good thing though, you will get worse gas mileage and cause greater emmisions. Better to put high octane in there.
I asked the Lincoln Mercury dealer about this and they said that for optimum performance I should use a minimum of 91 octane but that lower grades right down to 87 octane regular can be used. When octane grades lower than 91 are used, the ECC (engine control computer) will automatically detune the engine to prevent knock although you will have a slight power loss. Using an octane grade lower than 91 will not hurt the engine.
that is your prefference,it should run fine on 87 octane. but higher octane will not hurt engine.
87 octane should do fine. If you find it knocks a little then go to 89 octane. You can always use 91 octane, won't hurt, just in the pocket book.
the higher the octane the better, especially, if your in a state which has 10% ethanol in the gas...higher octane does NOT produce more power, but rather, increases a fuels resistance to pinging/detonation..higher octane, will not hurt anything, it can only help save a motor from detonation...when I say "high octane" I`m reffering to no higher then about 93...
hurt no, if you pulled your cord and it jerked your arm and hurt you have a shear fly wheel key.
87 octane is good for 3.1 but if ya want to use a different octane it wont hurt.
Just wasting money if vehicle does not "ping" on lower octane fuel