Last November Top Tier announced a new fuel called Top Tier+. It is designed for use in direct injected engines. As per the announcement at the link below it is supposed to be available later in 2025. Has anyone seen or tried this fuel? I did a bunch of Internet searches but could not find any stations specifically listing that fuel for sale.

https://www.toptiergas.com/2024/11/0...nce-standards/

Haven't seen any mention of TT+ "in the wild", yet.



But with direct-injection engines, you need to clean the INTAKE tract. I do this once a year with CRC Intake & Turbo Cleaner, to make the top-side of the valves and injectors clean. If I ever need to replace our injectors, hopefully this process will make them easier to remove.

Adding a solvent (TopTier or Seafoam) into the fuel doesn't help with this, tho' it WILL keep your injectors spraying cleaner.

the process starts at 10:45:

Very interesting, thanks for posting. I will definitely keep an eye out for TOP TIER+. Took a quick Look around and I can’t see much mention of it anywhere.

The video mentions turbocharged engines but not supercharged (full disclosure: I didn't watch the whole thing). I've been reluctant to try something like that through the supercharger since I don't want to damage the coating on the screws. I may be worrying about nothing but I'm also trying to avoid solving a problem that doesn't exist. My supercharger was just off for coolant pipes and the dealer said nothing, yet I'm sure they had a clear view of the intakes. I trust my Service Adviser and the dealer to be fair and do work properly, but I am also sure that if there were something of concern, or even interest, they'd have called it to my attention.

On a direct injection engine the only things that will see fuel (or any additives in the fuel) are the fuel injectors. The intake valves couldn't possibly benefit from fuel as it does not pass through the intake tract like a port injection engine. Just air passes through...and any by products from the engine PCV system which is where the deposits come from on intake valves.

[QUOTE][On a direct injection engine the only things that will see fuel (or any additives in the fuel) are the fuel injectors./QUOTE]

That is why applying the CRC through an intake vacuum line is beneficial. Discourages carbon buildup on the valves (AND on the injector housings that make injector removal so #*&^%$ difficult.

Look at this Topic, posts 54 & 55 specific
https://www.jaguarforums.com/forum/x...3/#post2182115

On the AJ126/133, yes the fuel isn't touching the intake valves. Gen V smallblock actually has the injector angled to have some overlap with the intake valve when it opens. They get cleaning from the fuel mist.

Many GDI engines also have supplemental port injection now. It ultimately depends on the configuration of the DI.