I'm looking for more information on these products based on my applications. So, I've been using SL-1 & P.I for typical GDI cleaning every oil change for vehicles. Now I have a new 2026 Harley Davison 117 V-Twin, lawn mower, and soon a snow blower. I've been treating the new motorcycle at the pump and small engine portable jugs with Ethanol FREE 91 fuel with SI-1 maintenance dosage. My goal is just to have a jack of all trades master of none fuel additive. Little cleaning, cylinder/fuel pump lubricant, octane improver. I'm not concerned about ethanol treatment since I run ethanol free fuel. Now it seems like Redline lists everything I need plus it's great for GDI vehicles. So being a mostly Amsoil consumer I was looking to maybe try to find the SI-1 similar equivalent like Amsoil Quick Shot, but it seems like it more geared towards fighting ethanol. Unless flagship Amsoil P.I does have upper cylinder lube which they don't list I don't believe they have something like SI-1. Should I mess with success? Regardless I have plenty SI-1 on hand and a small dwindling stash of P.I. @Pablo Any tips?
Redline SI-1 vs Amsoil Pi vs Amsoil Quick Shot
- Thread starter Nuclear_42
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Sounds like Amsoil Upper Cylinder Lubricant is what you may be looking for using continuously.
Looks like their price for this UCL has gone up almost 40% in the past year. Ouch!
What part of the USA do you live? I have two cases which I doubt I'm now going to use due to a shift in what I've determined works good in my 2025 Pilot at minimizing carbon deposits. I use the Quick Shot in 90 octane, non-ethanol gasoline used in my pressure washer. Probably an overkill, but that's what I do.
Looks like their price for this UCL has gone up almost 40% in the past year. Ouch!
What part of the USA do you live? I have two cases which I doubt I'm now going to use due to a shift in what I've determined works good in my 2025 Pilot at minimizing carbon deposits. I use the Quick Shot in 90 octane, non-ethanol gasoline used in my pressure washer. Probably an overkill, but that's what I do.
Thing is, nothing you put in your fuel will really clean up a true GDI mess on the intake side.
No small bottle from anyone will improve AKI significantly.
Do fuel pumps need extra lube? I actually wonder about that.
I would stick with a good injector cleaner.
What about combustion chamber cleanliness?
Help a tiny bit. I'm not seen any studies on fuel AM additives helping ring land cleanliness but maybe a 2x-3x dose could help clean.
https://www.amsoil.com/p/amsoil-p-i-performance-improver-gasoline-additive-api/?zo=515729
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