If so what was the result? Are there any mechanics out there that can answer this?
2007-01-08 13:41:00 · 9 answers · asked by Trench Foot 2 in Cars & Transportation ➔ Car Makes ➔ Subaru
The "mechanic" that posted above is DEAD wrong. He mentions that he only uses premium fuel for the STi.
***NEWSFLASH***
The Forester XT and STi share the same engine!!!!
Use premium fuel, 93 if possible, but 91 if that's the best you can do.
The result will be reduced performance, fuel economy, and in the very long term, even the life of your engine.
zv
2007-01-09 06:33:00 · answer #1 · answered by zero_vertical 2 · 1⤊ 1⤋
I work at a full service gas station in a northern part of the country, and we see Subarus all the time, including Foresters. I would have to say that I practically never put premium fuel in the Foresters, or any Subaru besides the two Impreza WRX-STI models that come in all the time. The drivers have never complained about any odd noises or mechanical problems due to using regular fuel either. However, I do know that if you put too much fuel into the tank (the tank is vacuum operated, somewhat of a rarity among cars), it will cause the "Check Engine" light to come on. If you don't turn the cap until it clicks a couple times, making sure the seal is good between the cap and the opening, this will also cause the "Check Engine" light to come on. The only downside is, if the engine does recommend premium, you may get ever-so-slightly better performance and/or fuel economy with premium fuel. Where I come from, that benefit doesn't outweigh the extra cost for premium fuel.
On the other hand, there are rare cases where a vehicle may actually need the premium fuel to run good. Case in point at the station where I work is the Lincoln Town Cars and Cadillac Sevilles that come in frequently. Some of them need premium, and I've asked the drivers if regular fuel will work instead. They say that regular fuel makes the engine stumble. But the rest of the drivers say the engine runs fine on regular fuel, and they've stopped buying the premium fuel.
What you should do is the next time you fill up, use regular fuel. If the engine runs fine, then keep using regular fuel. If the engine balks or makes funny noises, or the "Check Engine" light comes on, then add an octane booster and fill up on premium the next time. If the noises go away after that, try the same test using midgrade fuel. My prediction is, unless you've tuned your engine beyond what's normal, then the regular will work just fine.
2007-01-08 14:36:22 · answer #2 · answered by Ryan B 4 · 0⤊ 3⤋
Your car will start to ping and knock but your knock sensor will compensate to avoid damage to your engine. Also, your engine will not perform as it should with the lower octane.
Why cheat on maybe an extra $5 to $7.00 difference to fuel up your Forester with 91 octane vs. 89 Octane. As well using lower octane in your subie than what is recommended in your owners manual will decrease your fuel economy as the motor will not be performing as it should.
2007-01-08 15:27:00 · answer #3 · answered by Anonymous · 2⤊ 0⤋
your engine wont run the same, the turbo will sound funny and there will be a "ping". If you do it once for an emergency, your engine really would be fine. If the subaru is like my saab 9-5 aero, the computer will compensate for the lower grade and actually inject more gas into the engine.
2007-01-08 14:05:48 · answer #4 · answered by pghpanthers2 2 · 1⤊ 1⤋
A new mustang is vague at best, but I'll play along, assuming you mean a Mustang GT the mustang makes 300 horsepower traveling through a five speed manual, the Forester makes just over 200 traveling through a five speed manual. The Forester is all wheel drive and the mustang is just rear, assuming drivers of identical talent, the mustang weighs less, makes more power, and loses less to the drive train, it wins every time.
2016-05-22 21:34:42 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Subaru Turbo engines run hotter than most. It needs the higher octane to perform properly. You should also use synthetic oil 5W-30 for oil changes.
2007-01-09 02:31:58 · answer #6 · answered by ? 7 · 1⤊ 1⤋
Yeah can we pls get a name of the gas station that dude works at? So we don't ever take our cars there?
That's just plain wrong.
Use the octane that is recommended in your owner's manual.
2007-01-09 06:58:36 · answer #7 · answered by BP 2 · 0⤊ 0⤋
if you accidentally put regular gas in, you should add a bottle of octane boost until you run out that gas for sure
2016-08-14 05:12:09 · answer #8 · answered by Nineteen Sixty Nine 1 · 0⤊ 0⤋
knock sensor will go off and ck engine light may come on.
2007-01-08 13:54:14 · answer #9 · answered by sleepydo 5 · 2⤊ 1⤋