Need to use higher octane gas on my suburu?

Question

My mechanic says reason my crank sensor broke on my suburu is because I was only using regular gas; he says need to use high octane on suburus or it is common for the crank / knock sensor to break. Does this sound right?

Answer 1

We used M-Stoff and B Stoff in our Aggregat-4s that would give us a range of about 200 kms. Might work in your Suburu.

Answer 2

Which Subaru have you got. The turbo tuned Subarus should be run on high octane for two reasons:
1 The higher octane feuls let the engine run more efficiently and have additives which help to prolong the life of your engine
2 The cars are more highly tuned and running lower octane feul can cause the car to knock or ping due to premature detonation.
As for the knock sensor breaking I don't know, but it could be possible. The knock sensor works by sensing harmonics in the firing chamber caused by premature detonation. If you have prolonged harmonics due to knocking it could cause the sensor to wear out. But if you are unsure always get a second opinion from another mechanic.

Answer 3

Knock sensor is just a condencer microphone that picks up engine knock from low octane fuel. That knock signals the ECM to take out timing advance. Good fuel proper engine timing will result in better mileage. You will have to test that therory your self. With a new knock sensor try a couple of tanks of premium fuel and see if your gas mileage gets better 3 more MPG might justify the extra cost per tank full.

Answer 4

Regular gas is full of trash, the min you should go is pluse, no matter how old and junky the car is pluse should be used because regular fuel kills all kinds of things not just the crank/ knock sensor. it also clogs up fuel injectors and fuel filters it clogs up lines messes up the motor to where they don't last as long as they should so in the long run going $0.10 more a gallon saves you houndreds in the end.

Answer 5

No it does not, you can set up the ignition timing and carburation to accommodate any octane rating, compression does have a part to play but the Subaru does not run higher than 10:1which is acceptable.

Snow

Answer 6

analyse this your self now. A crank sensor, is a device that tells the on board computer, when to fire the plugs when it is their turn.

Gasoline, is the force that drives a piston down.
NOW! think about it. how can that break a sensor?

Answer 7

My boyfriend drives a 2004 forrester, which he says is supposed to take super unleaded. But with rising gas prices, he has been using regular but has had no problems.