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This is an interesting question.. one that I've been thinking a little about.
I've read that the detergents put in the cheaper gas aren't as good.. as a result they can leave a little more deposit on the valves, etc.. over time those deposits can build up and cause some detonation issues. This is normally not an issue with standard (non-direct injection), but I've heard that on DI motors this is a little more of a problem..
I know a co-worker has a Chevy SUV that states this explicitely in the owner's manual.
Anyone have input on this?
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