What fuel grade are you using in your RX350?
07-30-17 | 08:31 AM
#16
Pole Position
Joined: Jan 2005
Posts: 3,312
Likes: 518
From: Florida
I asked my service manager about this and the warranty and he laughed and said that the fuel you use will not void warranty. He said the only gas problems they have are people with contaminated fuel. Just a little too much water will mess up the system big time.
07-30-17 | 10:24 AM
#17
Driver School Candidate
Joined: Nov 2014
Posts: 48
Likes: 15
From: VA
i have two of them and they love regular. Even my LX loves regular. Of course it would not know Premium as even my dealer filled all of my vehicles with regular before delivery.
Like me I have said before, this is near a religious thing and each has to choose what you think is best.
The oil companies love the extra money. You may not be getting the octane you think as my station told me they get the regular tanks filled sometime twice a week while the premium is over a month. Fuel does lose octane over time so another reason to use regular for me, it is fresh. LOL!
Life is full of choices, pick your poison.
Like me I have said before, this is near a religious thing and each has to choose what you think is best.
The oil companies love the extra money. You may not be getting the octane you think as my station told me they get the regular tanks filled sometime twice a week while the premium is over a month. Fuel does lose octane over time so another reason to use regular for me, it is fresh. LOL!
Life is full of choices, pick your poison.
07-30-17 | 10:35 AM
#18
Pole Position
Joined: Jan 2005
Posts: 3,312
Likes: 518
From: Florida
i feel like your dealership should have at least filled them up with the recommended octane at delivery. My dealership gets their gas from the local Sunoco and they filled my hybrid up with Premium. If your vehicles are running fine on regular I guess it really doesn't matter though!
07-30-17 | 06:03 PM
#19
Intermediate
Joined: Apr 2017
Posts: 419
Likes: 109
From: NorCal
The question was how would Lexus know what gasoline you are using??
07-31-17 | 04:44 AM
#21
Pole Position
Joined: Nov 2016
Posts: 355
Likes: 53
From: NY
Mine seems to run better on 93oct. Always had a rough idle and some intermittent knocking. After two tanks the idle is solid and I haven't heard any knocking. Lets face i purchased a Lexus, the few extra pennies for high test isn't going to break me.
07-31-17 | 05:13 AM
#22
Pole Position
Joined: Jan 2005
Posts: 3,312
Likes: 518
From: Florida
Down here it can be 80 extra pennies of which still is not that big of a deal.
You are hearing knocking while it idles? Todays modern vehicles almost eliminate knocking.
If you "think" it runs better on 93, that is all that really matters.
We all have choice.
07-31-17 | 06:44 AM
#23
Pole Position
Joined: Nov 2016
Posts: 355
Likes: 53
From: NY
I did not buy Lexus to over pay for fuel.
Down here it can be 80 extra pennies of which still is not that big of a deal.
You are hearing knocking while it idles? Todays modern vehicles almost eliminate knocking.
If you "think" it runs better on 93, that is all that really matters.
We all have choice.
Down here it can be 80 extra pennies of which still is not that big of a deal.
You are hearing knocking while it idles? Todays modern vehicles almost eliminate knocking.
If you "think" it runs better on 93, that is all that really matters.
We all have choice.
Since using the 93 the idle is smoother and have not heard any knocking. Don't get me wrong the knocking was slight but it was definitely there. No stranger to this as most drivers probably wouldn't even pick up on it.
07-31-17 | 08:11 AM
#25
Driver
Joined: May 2017
Posts: 193
Likes: 44
From: NY
Solution: Fill up only with Top-Tier REGULAR gas in RX350 (Premium gas in RX450), purchasing higher octane than the recommended is a waste of $$$. RX350 does have a high compression ratio of 11.8 (13 for RX450), but this is 2017 and by now they know how to properly feed the engine to eliminate knocking.
tdjacw, Can you record a short video of the knocking that you hear?
tdjacw, Can you record a short video of the knocking that you hear?
07-31-17 | 12:18 PM
#26
Pole Position
Joined: Nov 2016
Posts: 355
Likes: 53
From: NY
Solution: Fill up only with Top-Tier REGULAR gas in RX350 (Premium gas in RX450), purchasing higher octane than the recommended is a waste of $$$. RX350 does have a high compression ratio of 11.8 (13 for RX450), but this is 2017 and by now they know how to properly feed the engine to eliminate knocking.
tdjacw, Can you record a short video of the knocking that you hear?
tdjacw, Can you record a short video of the knocking that you hear?
I don't plan on switching back to regular. I only put about 7k miles a year so its really not a lot of extra money.
07-31-17 | 01:35 PM
#27
Pole Position
Joined: Jan 2005
Posts: 3,312
Likes: 518
From: Florida
Solution: Fill up only with Top-Tier REGULAR gas in RX350 (Premium gas in RX450), purchasing higher octane than the recommended is a waste of $$$. RX350 does have a high compression ratio of 11.8 (13 for RX450), but this is 2017 and by now they know how to properly feed the engine to eliminate knocking.
tdjacw, Can you record a short video of the knocking that you hear?
tdjacw, Can you record a short video of the knocking that you hear?
07-31-17 | 01:48 PM
#29
Pole Position
Joined: Jan 2005
Posts: 3,312
Likes: 518
From: Florida
07-31-17 | 02:23 PM
#30
Racer
Joined: Feb 2017
Posts: 1,555
Likes: 343
From: Ontario, Canada
Solution: Fill up only with Top-Tier REGULAR gas in RX350 (Premium gas in RX450), purchasing higher octane than the recommended is a waste of $$$. RX350 does have a high compression ratio of 11.8 (13 for RX450), but this is 2017 and by now they know how to properly feed the engine to eliminate knocking.
tdjacw, Can you record a short video of the knocking that you hear?
tdjacw, Can you record a short video of the knocking that you hear?
Just because the engine can cope with 87 it doesn't mean that's recommended. This is from my Owner's Manual page 739....
Except EU area:
You must only use unleaded gasoline.
Select unleaded gasoline with a Research Octane Number of 95 or higher for optimum engine performance.
You must only use unleaded gasoline.
Select unleaded gasoline with a Research Octane Number of 95 or higher for optimum engine performance.
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