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Message: <blockquote data-quote="stutaeng" data-source="post: 23675" data-attributes="member: 6175">The E85 was only on the L59 RPO code engine. E85 is the same thing as flex fuel, correct? I want to say that engine got introduced prior to 2004, but I can't remember exactly when? Maybe 2002?The 5.3 (L59) engine I swapped into my Silverado came from a 04 Yukon XL and that one had return style fuel system. Which is strange now that I'm reading this and connecting the dots... Ummm</blockquote>