SAE Viscosity: 15W40. Castrol CRB 15w-40 Multipurpose Diesel Engine Oil - 20 Litres 20L. Castrol CRB Multi 15W-40 CI-4/E7 is a multi-purpose, heavy duty diesel engine oil. Castrol CRB Multi 15W-40 CI-4/E7 combats these issues in two ways.
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