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.