View Poll Results: OCTANE - Which gas do you put in your 3IS
I always use 91 or higher.
259
91.20%
I sometimes use 89 or 87.
3
1.06%
I always use 89.
6
2.11%
I always use 87.
16
5.63%
Voters: 284. You may not vote on this poll
OCTANE - Which gas do you put in your 3IS and why?(merged threads)
05-04-17, 02:22 PM
#121
Another one of these threads. Input isn't needed because you shouldn't put anything less than 91.
Here's more input for your reading enjoyment.
https://www.clublexus.com/forums/is-...-cruising.html
https://www.clublexus.com/forums/is-...gular-gas.html
Here's more input for your reading enjoyment.
https://www.clublexus.com/forums/is-...-cruising.html
https://www.clublexus.com/forums/is-...gular-gas.html
05-04-17, 02:47 PM
#122
I got this from the manual:
Select premium unleaded gasoline with an octane rating of 91 (Research Octane Number 96) or higher required for optimum engine performance. If 91 octane cannot be obtained, you may use unleaded gasoline with an octane rating as low as 87 (Research Octane Number 91). Use of unleaded gasoline with an octane rating lower than 91 may result in engine knocking and significantly reduced performance. Persistent knocking can lead to engine damage and should be corrected by refueling with higher octane unleaded gasoline.
Select premium unleaded gasoline with an octane rating of 91 (Research Octane Number 96) or higher required for optimum engine performance. If 91 octane cannot be obtained, you may use unleaded gasoline with an octane rating as low as 87 (Research Octane Number 91). Use of unleaded gasoline with an octane rating lower than 91 may result in engine knocking and significantly reduced performance. Persistent knocking can lead to engine damage and should be corrected by refueling with higher octane unleaded gasoline.
05-04-17, 05:19 PM
#124
Lead Lap
And yet, people still ask these questions.
Obviously, price is the ONLY deciding factor between higher fuel grades.
However, people would continue using lower octane and argue that "price is not a factor". Apparently it is.
"$5 is not a concern, but I'm gonna buy the cheaper stuff because I'm a skeptic." BS.
Obviously, price is the ONLY deciding factor between higher fuel grades.
However, people would continue using lower octane and argue that "price is not a factor". Apparently it is.
"$5 is not a concern, but I'm gonna buy the cheaper stuff because I'm a skeptic." BS.
05-04-17, 05:27 PM
#125
Instructor
Buy a Toyota Yaris if u wanna save gas ! Drivers with knowledge only put top tier gas for Lexus IS , why u buy a 40k$ Car and you are so cheap ? Stop mentioning about give money to homeless and u never did, I donated 2k$ + a year to share life here , who does the same ? No offend but most member on CL loves to argue and this is what I like , we learn and share knowledge from each other's lol
05-04-17, 05:34 PM
#126
Lead Lap
You initial post said price isn't a concern. So if it isn't a concern, just put in 91 like you're supposed to. End of story. Shouldn't be concerned with 5 extra dollars in gas when driving a 40-50k Lexus anyways...
Last edited by premier3IS; 05-04-17 at 05:37 PM.
05-04-17, 07:07 PM
#127
My step-mom has a Supercharged Range Rover and runs 87 all day in it. Guess what, it still hauls *** and purrs like a kitten! A little 2.0T doesn't need 91+. If you read the gas pump it says, "MINIMUM" Octane Rating! Theres a good chance that if you pump 87, you may very well be pumping 88/89. If you pump 91, there's a good chance you're pumping 92/93. Its your money but unless you plan on racing the car all day every day, putting 91+ in it, IN MY OPINION, is a waste.
05-04-17, 08:32 PM
#129
Lead Lap
My step-mom has a Supercharged Range Rover and runs 87 all day in it. Guess what, it still hauls *** and purrs like a kitten! A little 2.0T doesn't need 91+. If you read the gas pump it says, "MINIMUM" Octane Rating! Theres a good chance that if you pump 87, you may very well be pumping 88/89. If you pump 91, there's a good chance you're pumping 92/93. Its your money but unless you plan on racing the car all day every day, putting 91+ in it, IN MY OPINION, is a waste.
05-04-17, 08:53 PM
#130
Driver School Candidate
Yeah. In the end it all comes down to if you wanna treat your car right. Everyone has their own personal opinions about this topic and really, its still pretty controversial.
05-04-17, 09:09 PM
#131
I think most people misunderstand what octane rating means.
The octane rating of gasoline essentially tells you how much the air-fuel mixture can be compressed before it will spontaneously ignite. Spontaneous ignition is called detonation, also called spark-knock. Spark-knock is an erratic form of combustion that can cause head gasket failure as well as other engine damage. Generally speaking, the higher the engine's compression ratio, the higher the octane required to avoid spark-knock.
With me so far?
Now, considering that our IS 350's have a relatively high compression ratio of 11.5:1, it is this fact, and only this fact, why Lexus engineer's recommend premium octane gas. It is not for fun performance reasons. It is to maintain the normal performance of the engine over a longer period of time.
Using lower than specified octane gas will absolutely damage your engine over time. Period!
Want to verify for yourself? Google "Why different octanes are used" and also google "What causes spark-knock."
The octane rating of gasoline essentially tells you how much the air-fuel mixture can be compressed before it will spontaneously ignite. Spontaneous ignition is called detonation, also called spark-knock. Spark-knock is an erratic form of combustion that can cause head gasket failure as well as other engine damage. Generally speaking, the higher the engine's compression ratio, the higher the octane required to avoid spark-knock.
With me so far?
Now, considering that our IS 350's have a relatively high compression ratio of 11.5:1, it is this fact, and only this fact, why Lexus engineer's recommend premium octane gas. It is not for fun performance reasons. It is to maintain the normal performance of the engine over a longer period of time.
Using lower than specified octane gas will absolutely damage your engine over time. Period!
Want to verify for yourself? Google "Why different octanes are used" and also google "What causes spark-knock."
The only person with a proper answer.
05-05-17, 04:52 AM
#132
Instructor
my TRD Toyota solara V6 gas cap says "unleaded fuel only" reason why I stay positive because it's a big different between the regular fuel and the premium fuel , I've learnt this 16 years ago. I put regular it drives fine but pulling sucks like 4cyl corrola. And then I had to replaced knock sensor after 2 years of running regular cost me 350$ oem sensor. Yes it's up to drivers though. Regular fuel sometimes makes the car jerking what I've experienced .
Last edited by Solara350; 05-05-17 at 04:57 AM.
05-05-17, 01:01 PM
#134
05-05-17, 02:15 PM
#135
I see this a lot with BMW owners. People get into a beautiful looking 6-7 year old 7 series ($90k car) and then can't afford to fix a suspension bushing or a piece of electronic that goes bad. Eventually, a few years later these things become pieces of garbage rolling down the road w/ issues galore.
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