Taco John's publishes real per-item ingredient statements, and they show the fryer oil is a soybean/corn/sunflower blend and all six soft tortillas list soybean oil and canola, so every fried item and every soft taco or burrito carries seed oil before you add a sauce. 90 of 109 food items also carry an additive; the one genuinely clean main is the hard-shell taco, whose shell is just corn masa, water and lime.
Rated from Taco John's own per-item ingredient statements (nutritionix.com/taco-johns/ingredient-search/premium, 130 entries, 109 food). Seed oils: their fryer oil is stated verbatim as "Soybean Oil, Corn Oil, and Sunflower Oil with Dimethylpolysiloxane added to reduce foaming", so Potato Oles, chips, churros, donut bites, tenders and popcorn shrimp all go through it. All six soft tortillas list soybean oil, canola and vegetable shortening, so every soft taco, burrito and quesadilla carries seed oil in the wrap alone. Every creamy dressing and sauce lists soybean or corn oil, as do both nacho cheeses. 48 of 109 food entries name one outright and that undercounts the fried items. No swap offered. The real exception: the Hard Shell Tortilla is corn masa flour, lime and water, and Seasoned Ground Beef, House Salsa, Guacamole and Queso are clean, so a hard-shell Crispy Taco is genuinely orderable around it. Additives: 90 of 109 food items carry at least one.