What would 87 octane do to the car?
#1
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What would 87 octane do to the car?
So, today I went up to my local Shell station. Put my card in like I always do, and pressed 93. Started fueling and just doing the average gas pump stare into nothingness for a few seconds, when the price $2.12 caught my eye on the pump. I know, for a fact that I pressed the 93 octane switch (in fact, once I realized it was pumping at 2.12, I pulled it out, and tried to refuel again, and found that pressing the button twice on this pump changes it from the 93 octane price to the 87, weather or not the gas changes I don't know ) Regardless, I'm a little worried, even though only about 2-3 gallons got into the car of what could be low grade, they say don't do it. Anyone ever done that before? What could happen? Or will it all be good?
#3
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I did search for "87 Octane gas" and got nothing of value, since it returned everything that ever said the word gas in it.
And I'll call them and ask for the Flux capacitor, that way I can go back in time and stop my self from posting.
And I'll call them and ask for the Flux capacitor, that way I can go back in time and stop my self from posting.
#4
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I though the big problem with 87 octane is that it softens the rotors, causing them to mutate into pistons.
It's possible the owner's manual says something about octane requirements.
Ken
It's possible the owner's manual says something about octane requirements.
Ken
#6
I did the same search and found lots of value related to your question. Here you go:
https://www.rx8club.com/showthread.p...t=premium+fuel
https://www.rx8club.com/showthread.p...t=premium+fuel
#8
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I filled up with 87 once.
Later that night, I fell down the stairs while my 8 was out with my friends and thats why I have this black eye. I swear my 8 had nothing to do with giving me this black eye.
Later that night, I fell down the stairs while my 8 was out with my friends and thats why I have this black eye. I swear my 8 had nothing to do with giving me this black eye.
#9
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From the owner's manual:
Your Mazda will perform best with fuel listed in the table.
Fuel Octane Rating*(Anti-knock index)
Premium unleaded fuel 91 [ (R+M)/2 method] or above (96 RON or above)
You may use a regular unleaded fuel with an Octane Rating from 87 to 90 (91 to 95 RON) but this will slightly reduce performance.
Fuel with a rating lower than 87 octane (91 RON) could cause the emission control system to lose effectiveness. It could also cause engine knocking and serious engine damage.
Your Mazda will perform best with fuel listed in the table.
Fuel Octane Rating*(Anti-knock index)
Premium unleaded fuel 91 [ (R+M)/2 method] or above (96 RON or above)
You may use a regular unleaded fuel with an Octane Rating from 87 to 90 (91 to 95 RON) but this will slightly reduce performance.
Fuel with a rating lower than 87 octane (91 RON) could cause the emission control system to lose effectiveness. It could also cause engine knocking and serious engine damage.
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Now that we have all had a laugh at my ignorance, I thank you for the info in this thread.
btw, Mazda said flux capacitors are back ordered... too many people using 87 octane I guess.
btw, Mazda said flux capacitors are back ordered... too many people using 87 octane I guess.
#12
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I switch off, in the city (90% of the time) where I drive a little more aggresive, I use 93 but if I am going on a long road trip in decent weather I use 87 because why waste 93 when you are at cruising speeds most of the trip. In the summer I run 93 always.
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87 is fine. Just might suffer a slight performance loss. Other people claim to get increased mileage on 87 as well, there are a bunch who use it.
#16
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Go for it and report it back in a few months...You are the man...I vaguely remember the minimum is recommended 91 octane though for RX8...I might be wrong...
#19
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I always get better mileage with 87.
If I'm going for long trips I use 87, if it's stop-and-go city driving all week I go for 93 octane Shell V-Power (no ethanol!).
If I'm going for long trips I use 87, if it's stop-and-go city driving all week I go for 93 octane Shell V-Power (no ethanol!).
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Ah that's lucky. I never find 91. Grades around me are usually 87, 89, 93. I'd have used 91 if it were available. But now I'm boosted so I'll stick with the 93 all the time now.
#23
What the PCM will do if the knock sensor send back a signal? And what is the short term fuel trim do? I guess there is still some margin before reach the limit but stated to use minimum 87 is a safe move just in case somehow the 87 at the pump is not reach what suppose to be. Of cause, if just finished 98, straight red line the car after filled up 87 at a pump station will be a risk. If let the pcm have enough time to adjust the fuel trim, I don't see any problem for filling up the 87.
The car burnt probably due to fuel hose burst or some bad modification workmanship/wrong parts installed. The maximum damage can be resulted for using 87 is just upgrade the number of engine being replaced from the car. This forum alone had so many 2nd or 3rd engine club members and rarely heard anything that related to a blown engine will cause fire at at the same time or just right after. If can't find any other evident for causing the burnt except the fuel, maybe it just the only lemon out of 100 thousand on the road.
The car burnt probably due to fuel hose burst or some bad modification workmanship/wrong parts installed. The maximum damage can be resulted for using 87 is just upgrade the number of engine being replaced from the car. This forum alone had so many 2nd or 3rd engine club members and rarely heard anything that related to a blown engine will cause fire at at the same time or just right after. If can't find any other evident for causing the burnt except the fuel, maybe it just the only lemon out of 100 thousand on the road.
Last edited by csl; 11-14-2008 at 03:35 AM.