LAUGFS D-TRON PLUS, SAE 15W-40 & 20W-50 is a superior performance, reliable heavy-duty diesel engine oil, designed with real-world understanding to lubricate a wide range of diesel engines requiring API CI-4, ACEA E7-22, and DTFR 15B110 (MB 228.3) performance levels, and SAE 15W-40 & 20W-50 viscosity classifications.