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I dont have Shell where I live and have been using Costco on my F150/Saab. What do you recommend aside from Shell? What is your #2 and #3 recommendation after Shell? Dont have Chevron/Mobil/Exxon either.
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.
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.
No, only 91 although I'll be moving to where I'll have 93. That is the highest pump octane we have.
No, only 91 although I'll be moving to where I'll have 93. That is the highest pump octane we have.
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).
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.
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!
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.
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.
Thats great MPGs
Originally Posted by lobuxracer
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.
Is that a fact? Havent read that anywhere but it sucks if thats the case.
Is that a fact? Havent read that anywhere but it sucks if thats the case.
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.
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.
It is something I explain quite frequently. Euro/Asian/Australian Octane rating is not the same as the one used in North America. North American octane rating is an average of the RON + MON systems while Europe uses RON system
Here is a conversion chart. Octane 100 in Germany is actually Octane 96 in North America
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).
Doesnt matter that its TX, highest pump octane in the US is 93. You have specialty shops that have 100 and higher racing fuels.
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
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.
10-14-18, 12:39 PM
Yes- Amsoil Signature Series!
