Premium fuel required on the RX350?
05-05-23, 04:29 AM
#31
Pole Position
05-05-23, 04:36 AM
#32
I just got my first Lexus and my first car that requires something other than 87. I am a little worried about the gas prices. I have not yet had to fill my tank to see the shock the gas total cost. My dealer said I could use 87 but I may see issues. My ride is way to quiet to gamble on this. You buy a nice car, but the right gas in.
05-05-23, 05:10 AM
#33
Unfortunately all new 2023 RXs hybrids and non-hybrids have switched to premium gas requirement or recommendation according to our local Lexus salesman and service advisor whereas the previous 4th generation RXs use regular except for the hybrids. My neighbor has a 2023 RX350h and he says premium is required and my cousin in San Francisco has a 2023 RX350 (non-hybrid) and it uses premium. Both my neighbor and cousin didn't know about premium fuel requirement until they bought the vehicle. My suggestion is to use a mid grade 89-90 octane gas as a compromise to the premium grade of 91-94 octane. You can always try out the regular grade (87 octane) for the first couple of tanks to see whether it deteriorates the performance.
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Freds430 (05-05-23)
05-05-23, 02:02 PM
#34
Intermediate
beating a dead horse
I have no idea why so many people pay more than fifty thousands bucks for a car yet can't seem capable of reading their owner's manual, and understanding the fuel requirements (not recommendations) of their vehicle. It really is not that complicated.
05-05-23, 02:27 PM
#35
To many people, a vehicle is another appliance. Once the new wears off they could care less as long as it doesn’t strand them. That gives this board a much different vibe than say a Supra or GTI forum would have.
05-05-23, 02:29 PM
#36
Pole Position
What changed was vehicles with computer controlled engines that adapt to just about whatever you put in the gas tank.
05-05-23, 04:22 PM
#37
Driver School Candidate
When I made my original post I had read the 2023 Rx350 brochure and it did not mention the premium fuel requirement. I have had 7 previous RX’s and none required premium fuel. So I put my deposit down and the dealer started looking for the RX In my colors. They found one going to Va. and it was being built this week. It won’t get here for about 3 weeks. So I did not have an owners manual to read.. Anyway, I was having coffee with a friend who told me about the fuel required and I was surprised to hear about it. I then went online and found a manual and sure enough it’s true. My question was whether or not using regular fuel will harm the engine. As you can see from all the replies it’s far from clear it.
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ggebhardt (05-06-23)
05-06-23, 09:05 AM
#38
Pole Position
Yes. The hybrid is recommended. Not required. So the initial statement that all have switched to premium is misleading. Only the non hybrid has truly switched to premium. The hybrid is absolutely fine with regular fuel and the non hybrid probably is as well. I had a 2019 Audi Q7 3.0 that “required” premium. The service manager told me regular was fine. That’s what I used the whole time I owned it. I’ve never heard of a warranty claim being denied for any vehicle because premium fuel wasn’t used. If I had, and I had the gas engine 350, I MAY use premium.
05-06-23, 12:24 PM
#39
Pole Position
05-07-23, 04:13 AM
#40
Yes. I stand corrected. I was referring to the 350h.
05-10-23, 07:26 AM
#41
I have been filling up my 2023 RX350 with regular fuel so far and I do notice at times the vehicle will hiccup a bit. Going to try putting premium fuel in and see if that hiccup continues.
05-10-23, 08:45 AM
#42
Pole Position
05-10-23, 10:06 AM
#43
Intermediate
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Eagleboy99 (05-10-23)
05-10-23, 06:36 PM
#44
I already spoke to my Service advisor on the subject, just to get feedback or opinion on the matter. Asked if I put regular fuel what were the effects on the driving n point blank Asked him if it would void any warranty. He responded that he wouldn't make any warranties not be valid but that I would prob get some hesitation from a start position ( as above poster mentions) n that the fuel efficiency would lag some but nothing significant. I've only filled it up for my wife twice now who is the daily driver of our new RX350-- NON Hybrid. I put 89 octane both times, the first time by mistake. So I'm right in the middle 😆
