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There's no power gain for high octane, but there is a power loss for lower octane. I don't know about other models, but the IS350 requires premium. If you put less than that in there, the engine will retard timing to decrease engine knock. Doing that means the engine produces less power and is less efficient.
It is a standard, politically correct answer, nobody defined what this 'less' is. The car is might powerful for me.
Originally Posted by Olasek
It is a standard, politically correct answer, nobody defined what this 'less' is. The car is might powerful for me.
It's about 10-20 hp depending on how aggressive the knock sensor is. Will it damage the engine? Probably not in the short term but long-term use will shorten its life for sure. Will it matter to you? Probably not unless you plan to keep the car for 10 years.
You are making things up about engine damage but if it suits your fancy - go ahead. I am aware of the wording in the manual and I know what the technology guy at my Lexus dealership told me, this to me carries far more weight than any internet 'wisdom'.
You are making things up about engine damage but if it suits your fancy - go ahead. I am aware of the wording in the manual and I know what the technology guy at my Lexus dealership told me, this to me carries far more weight than any internet 'wisdom'.
Never said it damages the engine but lower octane in a high compression engine is more stressful for the engine over its lifetime. Do what you want since its your car but anyone reading this thread should be aware that the 3.5L is designed for 91 and up because it is a high compression engine. It will only make the advertised 306hp with 91 and up octane rating.
See below directly from Lexus on the IS350 (and for the 200t for that matter)
I come across this on the BMW forums too. People getting really aggressive about theirselves being wrong on something so blatantly obvious. Then I post something like this. Hundreds upon hundreds of times.
Sounds like this fuel thing is personal to some people due to the cost of premium vs. regular and they get angry when questioned on using the wrong stuff. Really really angry.
You are absolutely correct! A lot of people in America are cheap when it comes to gasoline prices and don't realize how fortunate we are to have such LOW gas prices. For this reason, we have the "mid-grade" option, while many other countries don't even offer it.
Originally Posted by E46CT
you're right.
you're wrong.
See below directly from Lexus on the IS350 (and for the 200t for that matter)
I come across this on the BMW forums too. People getting really aggressive about theirselves being wrong on something so blatantly obvious. Then I post something like this. Hundreds upon hundreds of times.
Sounds like this fuel thing is personal to some people due to the cost of premium vs. regular and they get angry when questioned on using the wrong stuff. Really really angry.
You are making things up about engine damage but if it suits your fancy - go ahead. I am aware of the wording in the manual and I know what the technology guy at my Lexus dealership told me, this to me carries far more weight than any internet 'wisdom'.
Brooo, I'm a technology specialist at Lexus. The guy that said the 350 does not require premium should get fired.
If your're concern about price.. Costco got premium gas for like $2.60/gal.
Never said it damages the engine but lower octane in a high compression engine is more stressful for the engine over its lifetime. Do what you want since its your car but anyone reading this thread should be aware that the 3.5L is designed for 91 and up because it is a high compression engine. It will only make the advertised 306hp with 91 and up octane rating.
Agree 100%
Originally Posted by Olasek
You are making things up about engine damage but if it suits your fancy - go ahead. I am aware of the wording in the manual and I know what the technology guy at my Lexus dealership told me, this to me carries far more weight than any internet 'wisdom'.
Honestly, whoever told you that at the dealership does not know what he/she is talking about. And like what others are saying, Lexus would not put 91 Octane or up as recommended fuel if the engine is not designed for it.
And by the way, these internet "wisdom" are usually more informative and realistic than what dealership can tell you.
09-26-16, 11:41 PM
