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CI-4 oil availability

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Does anyone know where to get 15w40 CI-4 without buying amsoil? I use amsoil in my 03 but I want to stick with conventional in my 98. I would love to find some valvoline premium blue classic and have emailed valvoline with no reply. I know im eventually going to probably have to switch to CJ-4 (or amsoil) but I want to put it off as long as I can.

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It may no longer be so, but before I changed to Valvoline Premium Blue, I could still get WallyWorld SuperTech 15W40 Dino in CI+ formulation. That oil was a good performer in my truck for over 80K miles without a complete oil change!!!

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