The knock sensor is there to prevent the kind of damage you're talking about. If it detects spark knock, it retards the timing to avoid the damage. Knock goes away, and so does the potential for damage. There are lots of people on these forums who only use regular and have zero problems with it. There is no reason to dump the extra 20 cents a gallon into some rich oil executive's yacht fund. Those guys have enough money. The car will run fine on regular in most circumstances, so why not try it? When the tank is empty, put in $5 worth of regular. If you don't like the results, fill it up the rest of the way with premium. Don't take anybody's word for it. Try it yourself and you'll see that there is no reason to pay more for premium.CadillacETC1997 said:Its this simple theres a reason why super is reccomended for you car. Now do you wanna defy that ok look at it this way whats worth more:
1. Save like 10 to 20 cents per gallons and risk screwing up something inside your motor which could be very costly to fix
2. Bite the bullet pay the increase and get prolonged life outta your engine and its components.
Choice is yours but i dont feel like riskin it.
To add to this, I suspect the algorithm is designed to err on the side of caution. By that I mean that if the KS does not respond as expected or the KS module fails a PCM test, it probably defaults to the lowest available timing maps (or the 87-or-lower octane timing maps) to avoid the potential for damage in exactly these circumstances. I don't know under what conditions the KS or KS module are tested, how often it happens, etc. That would be good information to have if anybody knows. I'm not going to hold my breath.Ranger said:You guys have this all wrong. The ONLY difference between 92 & 87 is the octane rating. Octane is nothing more than a measure of the fuels ability to resist spark knock. They do not burn at a different rates. 92 does not provide more power. Both have the same BTU output. Neither one burns cleaner. These are all myths that Shell Oil would like you to believe.
CadillacETC1997, I don't know where you are getting your information from but it is wrong. Burn premium if it makes you feel better, but it is NOT neccassary and you WILL NOT damage your engine by using a lower octane rating.
If the knock sensor went bad (very highly unlikely), the engine would ping, not immediately self distruct. You fix the sensor and move on. You are waaay to paranoid and misinformed about this.