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Discussion Starter #1
This is compeltely a newb question but I understand the important of running premium gas in a turbo supra or something of that caliber but can i run just regular gas in an is300? I'm looking at picking one up and I assume it will recommend premium but I was hoping with gas prices how they are I could just run regular ol piss gas.
 

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Turbology
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434 Posts
I'm pretty sure Lexus "recommends" premium fuel for all their cars, but unless you plan on any serious tuning, I would imagine you could run 87 in it.

BTW, great forum for the IS...

http://my.is/forums/

:)
 

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I'd recommend mid grade if you can't afford premium. I always ran premium in my Is300, but i did try it a few times with low grade and did notice the difference.
 

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Turbology
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Yup, if you can afford the car, you should be able to afford some decent gas too.
;)

You will notice a difference, more so if you add any performance upgrades. My friend has a GTI 1.8T chipped for 93 octane (kind of a no-brainer). He thought he could get away with lesser gas and the car ran like crap.
 

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It says to run premimum so why risk it. I believe the regular would not be good with the vvt-i. Of course with modern engines they'll sense the knock before the engine goes.
 

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Working OT
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I never put premium in mine. But I can tell a difference when I put in the 93 or the 89. I run that cheap shit in mine. Does seem a little quicker and smoother with the higher grade stuff but 3.20 is fucking nuts.
 

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Why did you buy an IS300 ? You can't afford the < $150 yearly difference by feeding it some premium vs regular? :nuts:
 

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my dad put 87 in my IS once. i could definitely feel the difference as it felt sluggish and definitely some "knock". id recommend against it
 

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Why did you buy an IS300 ? You can't afford the < $150 yearly difference by feeding it some premium vs regular? :nuts:
Word. This question *always* comes up on the IS300 forums and I never understood how you'd buy an IS and then skimp on gas. Penny wise and pound foolish.
 
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