The recommendation is Regular Gasoline. For the RX350 F

Hello everyone, I just joined RX 350 family with the delivery of 2022 RX 350 since my last car is aging (14 years). I've always put premium gas as i'm used to it for 14 years and now with the new RX 350, it uses regular gas. It is ok to keep continuing to fill it up with premium gas (Costco) or theres no benefit to it. Thanks

Your 2GR-FKS engine has VVT-iW on the intake valves to allow it to lower the compression ratio at low rpm and load conditions, such that it will not knock while running on 87 octane fuel. But the hp and torque ratings for your engine were obtained by Lexus using 91 octane fuel. From those two facts, you can deduce how to get optimal performance from your car. BTW, in addition to the Costco premium, my RX is very happy on Shell 89 octane. Just be sure to choose a Top Tier qualified fuel.

A good idea would be to take 15 minutes of so and read the last 50 posts in this thread and that should answer most of your questions, or get you more confused than ever.

The gas companies are sure hoping that you keep using premium gas in the RX350. They will be the only ones that will benefit.

To be fair to him, I merged his post into this thread so he didn't know it existed until after that...

Always good to search first!

I currently have my seventh vehicle that required premium gasoline of which I have used regular. Tried many occassions on each with premium and noticed absolutely no difference. I remember a thread awhile back here on this issue and a member swore his vehicle drove better and even said the transmission shifted smoother. Each vehicle drove over 100,000 miles before trading in or selling. Had ZERO engine issues. Experimenting with the other two levels, I have noticed zero difference in gas mileage or performance. I have used 87 in cars that have required premium for over a million miles and have not had one problem.
I always revert back to two MIT graduates that are car mechanics who had a syndicated radio show called Car Talk for 35 years.
http://www.cartalk.com/content/premi...egular-0#myth4

From the USA Today:
The only modern engines that should really need premium are those with superchargers, which force-feed fuel into the cylinders. "You're driving along and just tramp the gas and the knock sensor cannot sense the knock fast enough in some cases," because the supercharger boosts pressure so fast, says Bob Furey, chemist and fuels specialist at General Motors.

Burning regular when the owner's manual specifies premium won't void the warranty, nor damage the engine, even the most finicky automakers say. "You're giving up perhaps just a little bit of performance that a customer wouldn't really even notice, it's so slight," says Furey.I have researshed on the net and can not find one article that confirms the need to use premium except in a high charged turbo engine. So before the pissing contest starts please please if you want to use premium please do.



Good article and You Tube clip on gasoline grades.

https://www.consumerreports.org/car-...h-extra-price/

This isn't what he asked though. He asked if he should use premium gas when the owner's manual says regular. That is a complete no-brianer.

Why not use regular if the owners manual says so? The Lexus engineers say its ok, it's cheaper and it works. A no brainer.

The owners manual doesn't say to use regular !
It gives a WARNING not to go below 87 octane. All tests on the RX360 were done using 91 octane, a search in the thread will provide the info.
There are some benefits in using premium gas besides the obvious there are also the detergents to keep valves. EGR valve & piston head freer from carbon deposits, a benefit if you keep you car
for a long term or high mileage. In the end it's up to the individual and how well the machine performs.

My point that experets say you don't need premium even if it states premium one could easily assume if it states regular than you also don't need premium. Watch the Youtube clip.

My 2022 RX owners manual says 87. I wonder if your owners manual has a different number? It would interesting if you post your page so we can see that the Lexus is changing it year after year or model after model? I am going by my owners manual.. Also wanted to add my gas tank door says the same thing..

Can't read it, but if it's like mine it says to use octane of at least 87 or not to go below 87, I don't view that as a recommendation, but as a warning.

I think that can safely be called a minimum octane rating recommendation by the manufacturer.