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Formerly known as Shell Rotella T Triple Protection, Shell Rotella T4 Triple Protection 10W-30 Diesel Engine Oil is the most technically advanced Shell Rotella formulation ever. This heavy-duty engine oil has been formulated to provide Triple Protection technology against wear, deposits and oil breakdown. It uses advanced additive technology to protect under the most severe engine conditions found in modern, low-emission engines. Plus, it provides outstanding wear protection, emissions system compatibility and shear stability.