View Poll Results: What gas do you put into your 2RX?
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Do you need Premium Gas in the 2RX (merged discussion threads)
05-18-07, 10:54 AM
#181
BTW, MSDS sometimes disclose what in fuel additives bottle.
This guy compiled the data and here is a useful table. Obviously higher % of PEA stronger the stuff and more corrosive (for the lack of better words) it gets. Most of what in the bottle is kerosene, which is used as a carrier to additives.
Redline SI-1 30-50% PEA I believe
Gumout Large Vehicle Complete Fuel System cleaner 30-40%(Same stuff as regane, just larger bottle!)
Gumout Regane 30-40% PEA
Techron Concentrate(not PROGUARD) No one is really sure what the concentration level of PEA is, some have a theory it is 20-25% but no one knows for sure.
Gumout Large Vehicle Complete Fuel System cleaner 30-40%(Same stuff as regane, just larger bottle!)
Gumout Regane 30-40% PEA
Techron Concentrate(not PROGUARD) No one is really sure what the concentration level of PEA is, some have a theory it is 20-25% but no one knows for sure.
Last edited by TunedRX300; 05-18-07 at 12:27 PM. Reason: URL link fixed
05-18-07, 10:59 AM
#182
Linky, not worky....
05-18-07, 12:31 PM
#184
87 is good, per Toyota.
05-18-07, 12:39 PM
#185
Fixed in the revised post.
FYI
PEA stands for polyether amine, just to be clear I could care less about the brand of gas or fuel additive, as long as it delivers the result. If you wish to extract useful information amoung marketing messaging, here is Chevron's take on PEA. Apparently this is the stuff that allow Chevron to make it to the top tier gas list.
http://www.max-boost.co.uk/max-boost...0Additives.htm
FYI
PEA stands for polyether amine, just to be clear I could care less about the brand of gas or fuel additive, as long as it delivers the result. If you wish to extract useful information amoung marketing messaging, here is Chevron's take on PEA. Apparently this is the stuff that allow Chevron to make it to the top tier gas list.
http://www.max-boost.co.uk/max-boost...0Additives.htm
05-19-07, 09:21 AM
#186
Great information....should we be using additives? Or just get top tier gas? At least if you add additives...then you have plenty and not wondering.
05-19-07, 01:21 PM
#187
For someone with a bad case of carbon buildup, top tier gas can do little since % of additives in gasoline is much lower than a full blown treatment. Windex is a good cleaner, but you will never use it to clean BBQ grills, where the heavy duty oven cleaner works better.
For example, see va3ux's comment in this thread.
http://theoildrop.server101.com/foru...0&fpart=3&vc=1
If you have used top tier gas and no obvious problem, I would run a treatment every 6 months, just in case I caught a bad batch of gasoline.
In my case, Costco 87 octane rated gas with EPA minimum additives with Gumout Regane or Chevron Techron every 3-5K works well.
The goal is to keep vital engine parts clean, since no one can open up your engine to take a look, it takes a little experiement to find what suits you the best.
05-20-07, 04:01 PM
#188
Costco has the Chevron Techron, 4 pack @ $9.50. I will get some.
05-27-07, 04:41 AM
#189
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05-27-07, 02:49 PM
#190
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So the 3.5L in the RX350 is somehow "special" and requires higher octane fuel than the same exact engine with the same exact compression ratio that makes the same hp/torque numbers in the Camry, Avalon, Sienna or RAV4, and also the Highlander, which has almost the same intake/exhaust track as the RX? Sorry, don't buy it.
FWIW, my RX gets its best fuel economy on midgrade (89). Going to 87 or 91/93 I lose 0.8mpg. It runs just fine on 87 though, which is what Toyota recommends for this engine in every single application save its luxury division. There's nothing special about it just because it has a prettier engine cover on top.
FWIW, my RX gets its best fuel economy on midgrade (89). Going to 87 or 91/93 I lose 0.8mpg. It runs just fine on 87 though, which is what Toyota recommends for this engine in every single application save its luxury division. There's nothing special about it just because it has a prettier engine cover on top.
Last edited by geko29; 05-27-07 at 03:13 PM.
05-27-07, 07:32 PM
#191
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There's nothing special about it just because it has a prettier engine cover on top.[/QUOTE]
It is the same engine with a different cover with with a slanted L on it. No matter how you look at it it is still a Toyota..
It is the same engine with a different cover with with a slanted L on it. No matter how you look at it it is still a Toyota..
05-28-07, 04:00 AM
#193
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The 2007 RX350 manual says that 91 octane is required for optimum engine performance. If 91 is not available, 87 may be used.
To me, that's about as unequivocal as it gets. Lexus says that 87 is only acceptable if 91 cannot be found.
No, I'm not dumb enough to think that my car needs premium fuel because it's a luxury car. If the manual said 87 was fine, I'd be using it, just like I did for 6 years and 114K miles in my RX300. The manual doesn't say that, so I'm following the manufacturer's recommendation.
To me, that's about as unequivocal as it gets. Lexus says that 87 is only acceptable if 91 cannot be found.
No, I'm not dumb enough to think that my car needs premium fuel because it's a luxury car. If the manual said 87 was fine, I'd be using it, just like I did for 6 years and 114K miles in my RX300. The manual doesn't say that, so I'm following the manufacturer's recommendation.
Last edited by jmaynard; 05-28-07 at 06:46 AM.
05-28-07, 04:48 AM
#194
[/QUOTE]They could have exactly the same engine, down to the last bolt, and the computer on the Lexus could be programmed differently so you would need the higher octane in the Lexus. There could be a differrent cam shaft. There are a number of factors that could make a difference in engine life on lower octane. So, unless the manual on the Lexus says it is ok, you are playing with fire. There was a horsepower increase in the RX350. That means something was done to it. I am SURE the marketing department wanted the RX350 manual to say REGULAR gas, but the engineers over-road them.
05-28-07, 07:01 AM
#195
They could have exactly the same engine, down to the last bolt, and the computer on the Lexus could be programmed differently so you would need the higher octane in the Lexus. There could be a differrent cam shaft. There are a number of factors that could make a difference in engine life on lower octane. So, unless the manual on the Lexus says it is ok, you are playing with fire. There was a horsepower increase in the RX350. That means something was done to it. I am SURE the marketing department wanted the RX350 manual to say REGULAR gas, but the engineers over-road them.
I mentioned this in the other octane discussion thread: it is not the ECM programming, but different chassis require slight different intake and exhaust design that causes the slight performance variation.
For example, GS350 and IS350 use the same 2gr-fse engine, same octane rated gas requirement, but slight different intake and exhaust. Result is slightly different peak torque and hq. Official dyno from Lexus japan:
GS350 dyno
IS350 dyno
