Shell Rotella T4 Triple Protection 15w-40 is a premium Diesel Engine Oil. The Rotella series is a premium line of heavy duty equipment lubricants manufactured by Shell Lubricants. "T-4" refers to premium Triple Protection diesel engine oil formulated to provide protection against Wear, Deposits & Oil Breakdown. Its low ash additive package is compatibility with exhaust after treatment systems using diesel particulate filters (DPF), diesel oxidation catalysts (DOC) and/or selective catalytic reduction (SCR). 15w-40 is the thickness of the oil based on Society of Automotive Engineers (SAE) standards.
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