B
blondissamo
Guest
Sorry, my user's manual seems to be AWOL and with current gas prices...
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
K
kelly_f_1999
Guest
you know any gas will run in any car but really its what type you get the most miles with.. only way of knowing which type or brand your jeep or car need is by testing a few type and brand fill it mark or set mileage drive til it need to be filled again and set mileage again write it all down .. start with place you always stop at fill up with best they have set mileage see what it gets on a tank of and then try next type they have do the same... then stop at place you sometimes stop at and do the same not all gas is the same so knowing which gets you the most miles for the buck is what you want be it high octane or not .. its like my car gets great mileage with shell high octane but gets the same with mobil regular thats what you need to know what gets you the best mileage
G
glisseno
Guest
NO. 87octane is high enough cor stock street engines. One can go higher if they choose. But a performance increase will not be seen. The higher the octane the more stable the fuel is to with stand detonation and preignition or high compresson performance engines.
OG
SAE Master Tech
OG
SAE Master Tech
M
Mark T
Guest
There used to be a very simple test to see if you engine knocked (the reason for upping the octane). You would drive along at about 30mph and then floor the accelerator in 4th / 5th gear. With a low speed / high load if the engine was going to knock (or the clutch slip) that was when all would be revealed.
With automatic transmission and engine management units, that trick doesn't really work these days.
In short, if you fuel is a bit below par, then as the engine starts to knock, the sensor will hear the ping and tell the management system to retard the ignition. If that doesn't solve the problem, further retarding will take place.
This is good for two reasons - 1) in emergency it means your vehicle CAN run on lower octane fuel (or stale fuel) and 2) it prevents the knock causing damage to your engine.
It is BAD however because the moment your ignition starts to retard, your economy goes down, your power goes down and your fuel consumption goes up.
If a vehicle wants a higher octane to run without retarding the ignition it is a false economy to feed it lower octane fuel - because once the ignition has been retarded your economy will start to suffer.
If you can tell no difference in performance / economy when filling tank with different fuels, then go for it, usde the cheaper one - if it suffers, then switch back to the higher octane.
Mark
With automatic transmission and engine management units, that trick doesn't really work these days.
In short, if you fuel is a bit below par, then as the engine starts to knock, the sensor will hear the ping and tell the management system to retard the ignition. If that doesn't solve the problem, further retarding will take place.
This is good for two reasons - 1) in emergency it means your vehicle CAN run on lower octane fuel (or stale fuel) and 2) it prevents the knock causing damage to your engine.
It is BAD however because the moment your ignition starts to retard, your economy goes down, your power goes down and your fuel consumption goes up.
If a vehicle wants a higher octane to run without retarding the ignition it is a false economy to feed it lower octane fuel - because once the ignition has been retarded your economy will start to suffer.
If you can tell no difference in performance / economy when filling tank with different fuels, then go for it, usde the cheaper one - if it suffers, then switch back to the higher octane.
Mark