Is Shell Premium Considered Best Cleaning Gasoline?

[BMWTurboDzl]

TT+ is an additional standard for intake valve cleanliness, and IIRC, measurements of exhaust gas at the tailpipe. Except for some brands or independent stations choosing to be part of the program, I suspect the bigger players, e.g. Shell, Exxon/Mobil, Chevron, etc. already meet the TT+ standards.

I found some reports yesterday that the additives used by Shell prioritize cleaning and staying clean, while Exxon/Mobil prioritizes wear protection. That would explain the results shown above.

Based on Shell's prioritizing. cleaning, and my Pilot has a GDI engine prone to carbon deposits, I'm probably going to stick with Shell, as it's proven itself to work in my engine and how I drive.

Right but the study you posted was on TT not TT+. The additive package may be different which is why I'm questioning the relevance of the study

 

[melk]

Surprised how much “worse” Chevron gas is. Also surprised that ExxonMobil Premium outperforms Shell Premium in a number of ways.

 

[4wd]

Surprised how much “worse” Chevron gas is. Also surprised that ExxonMobil Premium outperforms Shell Premium in a number of ways.

And does this give rise to the question of Synergy being in all grades - looks like it in that test and at the pump - But surely it’s a higher dose in the premium …

 

[melk]

And does this give rise to the question of Synergy being in all grades - looks like it in that test and at the pump - But surely it’s a higher dose in the premium …

They do have some language on their website about Synergy+ in their premium. I think the 3x rate they advertise may be only for the top grade as well.

 

[Urshurak776]

I use Costco, which is a top-tier fuel, and a bottle of Techron gets put in around 400 miles before each oil change but have not been consistent with that since I started using top tier fuel.