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  1. Synthetic Motorsports
    AMSOIL Recommended Products For The LLY Model Duramax These AMSOIL products are recommended for the LLY model Duramax equipped GM trucks. ENGINE OIL: Synthetic 5W-40 Premium Diesel Oil (DEOQT) Below 0F......5W-40 [1] Synthetic 15W-40 Diesel and Marine Oil (AMEQT) Above 0F......15W-40 The...