Scotty, recently you posted how premium fuel is unnecessary in many engines, my question to you is can I safely use regular gas in a 2022 Lexus IS300 six cylinder engine?
Check your owners manual. It will tell you what fuel level is required. Some cars say it has to be premium only, some say at least 87 octane. So check your owners manual.
What does your users manual suggest? It always boggles my mind when people buy luxury cars or high performance cars that cost $$$ and then balk when they have to put premium gasoline in their vehicles. I am speaking in general here on a soap box, not picking on you or anything.
People probably didn't expect the sharp rise in fuel prices. We are all feeling the squeeze right now.
Welcome new member!
This comes up a lot on the forum, but your specific case is very intriguing. I'm not much of a Lexus specialist, but from what I can tell, Lexus recommends 91 octane or higher in all IS models, both the turbo-4 and the (I think?) naturally-aspirated 6. That's interesting to me, because you would expect the turbo to need premium, but traditionally, naturally-aspirated motors were fine on lower-test stuff.
However, modern cars are tuned much more for fuel economy than they used to be, and cylinder compressions are generally quite high. As a result, many naturally-aspirated engines are vulnerable to pre-ignition these days. So more and more cars require premium gas, turbo or not.
So, yeah, if your owners manual specifies 91 octane, that's what you will need to go with. Even if the odds of a problem are low with 87 or 89, you could void your warranty.
Cheers!
