Question about 1992 Lexus Ls 400

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Is it okay to mix regular octane gas with high octane gas?

I have about 158,800+ miles on my 92 Lexus LS400 and for about maybe 12+ years i dont think i have ever put any other gas in but regular....i am ashamed to say this but hey with gas prices you gotta get by. But would it be better to mix low an high octanes in my tank then just running straight regular?

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  • Lexus Master
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There is no advantage in mixing fuels If the car is tuned to run on regular leave it at that as the computer has been set for that fuel. Check with a dealer and find the recommended fuel for your vehicle . By going to a speed shop that has the ability to reset you cpu to a higher/lower fuel rating you can retune the motor. But if you are running on the recommended fuel leave it alone. It will be cheaper in the long run

Posted on May 05, 2013

  • Andrew Grubbs May 06, 2013

    well ya maybe if i didnt know what it was BUT it clearly says premium unleaded gas only. And yes there are advantages actually

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Whitenoize
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SOURCE: super-unleaded or premium gas for 2006 lexus ls 430

Well, of course premium is HIGHLY recommended, but it is not necessary.
You can use regular grade in your engine and it will not harm it at all. Modern engine management systems have knock sensors that detect lower grade fuel and make the necessary adjustments to your timing and fuel delivery systems.
All you will notice is slightly slower acceleration and a slight drop in engine horsepower.

Hope this helps...

Posted on Mar 23, 2009

localwonder
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SOURCE: Loud engine or Muffler

hi. if the muffler is truly cracked, it will release a loud, unfiltered, noise during acceleration and idling as well. it will rattle as well. i recommend replacing the muffler ASAP.

Concerning the fill up at 7-11, there may have been a high water content that was in this gas stations tank and, this was transferred to your tank during the filling. the Lucas treatment will remove the water out of the tank and correct any damage that may have occurred,if any..

Posted on May 16, 2009

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SOURCE: I have a 92 Lexus LS400 it won't start. It was

try giving it a jump or re-charging the battery too.

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SOURCE: 2005 Lexus RX 330

sounds like a bad speed sensor or a bad 02 sensor hope this helps

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SOURCE: engine runs rough when warm

check the coolant temp sensor very common problem on these cars

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3 Answers

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If premium is recommended then noise from the engine is very likely "knock." This can permanently damage the motor if it hasn't already.

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Gas


Best way to check is by looking at the gas cap. If it does not say "Premium fuel only" you should be safe. Higher octane rated fuel is used for higher compression motors, and I dont belive that your engine (my guess is the 5.4 V8 should be around 9:1 compression) needs the high octane.

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