My 2021 v6 atlas manual says to use regular octane fuel. Is there any real benefit to using high octabe? Is it still better to use high octane vs regular or is it just a waste? Thanks
Top Tier while certainly the best standard in gas to use, has zero to do with carbon build-up on the backs of the intake valves b/c the fuel never touches them in a DI engine.87 but use Top Tier fuel. This will help slow carbon build up on the valves due to it being a GDI engine. Shell, Exxon, BP, Valero and some others use Top Tier Fuel.
How exactly if it doesn't touch them? It's not doing a thing to the valves - only the injectors themselves (a positive!). Folks have debated this issue in online forums and social media for a long time including fuel type, oil quality, "Italian tune ups" and catch cans. None of it will prevent some build-up from happening on the back of the intake valves in a DI engine with no port injection to get some fuel/cleaners on the back of the intake valves. Most modern DI engines are not having issues like the earlier engines had and at worst, if you keep it long enough and have misfires/issues related, you get a walnut blast. I realize some bits online will reference Top Tier as helping but it doesn't....it physically can't.I am aware the gasoline doesn't pass over them. The Top Tier Gas helps keep the carbon build up down nonetheless. That's from my reading on it.
I have and my comments are based on it. For general combustion chamber cleanliness including carbon build-up...yes. Back of intake valves in a DI engine that the fuel never touches...no. Just not much you can do fuel-wise/additive-wise on a DI engine to prevent it from getting some carbon on the backs of the intake values unfortunately but for sure, use Top Tier-branded fuels.There is plenty of literature on the subject available on the internet. I encourage you to read it for yourself and formulate your own opinion based on it.
I don't think there is any possible way for octane rating to come into play in warranty discussions or certainly anyway to prove anything.I use what the manufacture says to use. It helps if you have any warranty issues. I used primum gas in my 2013 Toureg it helped get me a little better MPG and smoother running engine
Just bumping this thread for the same question. I'm in Colorado at 6000 feet. Shopping for an Atlas and considering both the 2.0T and the VR6. I think I would stick with 87 in the 2.0T insofar as the turbo partially compensates for the altitude. But I'm wondering if other high elevation owners use 85 in the naturally aspirated VR6. If so, that could partially offset the cost of the worse mpgs compared to the 2.0T. Dealer rep says it's fine, but I might try to get that in writing for warranty purposes.Here's my question. In Utah, MOST gas stations here have 85 or 91. I'm ASSUMING this is to offset for elevation (4700+ ft). Is this the case?