Real or Synthetic Oil....
#316
Lexus Test Driver
Do you get Octane 94 in your city? I assume you do since you are in Texas. I put Octane 94 only in my RCF and there is a very noticeable difference in responsiveness compared to Octane 91 most likely because of the high compression.
#317
No, only 91 although I'll be moving to where I'll have 93. That is the highest pump octane we have.
#318
Lexus Test Driver
Very surprising considering you are in TX. Anyway, once you get a chance to put Octane 93, do put that in your car especially if your car is not a daily driver (so don't have to fill up often).
#319
Tech Info Resource
iTrader: (2)
It won't make any difference if you run 91, 92, 93 or 94. The engine is tuned to run on California's crappy 91 octane that behaves like 89 octane. BTDT got many t-shirts.
If you are serious about this, you need to monitor KCLV - knock correction learned value - and you'll be able to see exactly what the fuel is doing by how the knock correction is responding to it. Lots and lots of info on this in the IS F forum.
If you are serious about this, you need to monitor KCLV - knock correction learned value - and you'll be able to see exactly what the fuel is doing by how the knock correction is responding to it. Lots and lots of info on this in the IS F forum.
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05RollaXRS (10-14-18)
#320
Moderator
iTrader: (7)
since fuel octane is being discussed, I want to ask the more knowledgeable people here what they think of this VP octane booster. Will it make a difference on the RCF? Would you recommend trying it? Or will it likely mess something up? Thanks!
Last edited by JT2MA71; 10-15-18 at 08:23 AM.
#321
Tech Info Resource
iTrader: (2)
Pretty unlikely. Most of these additives do very little to change octane. If you really want to boost octane, find a source of unleaded 100 octane and mix it with the best premium you have available. I did that for my Supra in California when they dropped premium from 93 to 92, then finally to 91. I got 12 mpg around town with their 91 garbage, so I went to the one station in town with 100 octane and put 4 gallons in the tank and filled the rest with 91. It worked out to a little over 93 octane, and my mileage went right back to 18 mpg around town.
All that said, Lexus vehicles are tuned from the factory to run acceptably on the 91 octane premium available in California, so it's really unlikely you'll see any noticeable performance improvement running fuel additives.
All that said, Lexus vehicles are tuned from the factory to run acceptably on the 91 octane premium available in California, so it's really unlikely you'll see any noticeable performance improvement running fuel additives.
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#322
Pretty unlikely. Most of these additives do very little to change octane. If you really want to boost octane, find a source of unleaded 100 octane and mix it with the best premium you have available. I did that for my Supra in California when they dropped premium from 93 to 92, then finally to 91. I got 12 mpg around town with their 91 garbage, so I went to the one station in town with 100 octane and put 4 gallons in the tank and filled the rest with 91. It worked out to a little over 93 octane, and my mileage went right back to 18 mpg around town.
#323
Advanced
In germany, they often have the 100 stuff. In Switzerland, 98 is the maximum we can find. Whatever, I don't see much of a difference between 95 and 98 in daily use on my actual car.
#324
Lexus Test Driver
Here is a conversion chart. Octane 100 in Germany is actually Octane 96 in North America
http://www.pencilgeek.org/2009/05/oc...nversions.html
#325
Doesnt matter that its TX, highest pump octane in the US is 93. You have specialty shops that have 100 and higher racing fuels.
#327
#328
Instructor
Yes- Amsoil Signature Series!
Holy smokes. This got resurrected again I see?
Well, since I'm here I may as well throw my 6 cents into this Thread once more!
As stated somewhere within here, I drank the Amsoil Kool-Aid many years ago for my Dodge Cummins and easily run it 25k miles before changing.
Another kind soul in here even posted about the truly Documented Date regarding the use of Amsoil as well (Need to find that Post again) Right now I am still within the two Free Lexus Oil Changes so I'll use whatever it is they provide (Mobil 1) THEN I will use my Amsoil "Preferred Membership" Account to obtain some of the very best liquids produced for just about everything on the Road = Amsoil
HA !!! Just used our famous "Search" tool and found I even created a Thread on it too! Anyone Using Amsoil for their RCF ??
Semper Fidelis !
Well, since I'm here I may as well throw my 6 cents into this Thread once more!
As stated somewhere within here, I drank the Amsoil Kool-Aid many years ago for my Dodge Cummins and easily run it 25k miles before changing.
Another kind soul in here even posted about the truly Documented Date regarding the use of Amsoil as well (Need to find that Post again) Right now I am still within the two Free Lexus Oil Changes so I'll use whatever it is they provide (Mobil 1) THEN I will use my Amsoil "Preferred Membership" Account to obtain some of the very best liquids produced for just about everything on the Road = Amsoil
HA !!! Just used our famous "Search" tool and found I even created a Thread on it too! Anyone Using Amsoil for their RCF ??
Semper Fidelis !
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BossMoss (10-19-18)
#329
Tech Info Resource
iTrader: (2)
And if you look at the oil change history on my IS F, you won't care what oil you are running, you won't run 25k miles on a load of oil without expecting a shorter service life from your engine. Iron tracks with mileage, and it's crystal clear when you look at the history (every oil change on my IS F had a Blackstone analysis), those longer intervals have more iron. The problem with more iron is, it's abrasive, and it will cause accelerated wear over time if you choose not to change it.
We don't have the ability to remove iron from our oil, and we don't have an oil filtering system good for much more than keeping the big chunks out of circulation regardless of which filter you choose, so between fuel dilution and elevated iron levels, I really doubt a 25k mile oil change interval is doing anything good for the health of your engine in the long run. Certainly you can do whatever you like, it's your engine, but I wouldn't choose that path for anything I run without strong supporting evidence the iron and fuel dilution are acceptable - and I am very skeptical you would find this to be the case.
We don't have the ability to remove iron from our oil, and we don't have an oil filtering system good for much more than keeping the big chunks out of circulation regardless of which filter you choose, so between fuel dilution and elevated iron levels, I really doubt a 25k mile oil change interval is doing anything good for the health of your engine in the long run. Certainly you can do whatever you like, it's your engine, but I wouldn't choose that path for anything I run without strong supporting evidence the iron and fuel dilution are acceptable - and I am very skeptical you would find this to be the case.
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JT2MA71 (10-21-18)