Castrol® CRB Multi 15W-40 CK-4 is a synthetic blend, multi-purpose heavy-duty diesel engine oil designed to provide superior protection for modern and older diesel trucks, buses, and off-road equipment. This versatile 15W-40 diesel engine oil meets the strict requirements of the latest engine oil specifications and can be used where API CK-4, CJ-4, and earlier categories are required. It’s engineered to help deliver long, healthy engine life, giving you peace of mind that your diesel engines are protected across a wide range of applications and duty cycles.

Ideal for mixed fleets, Castrol CRB Multi 15W-40 helps keep engines cleaner, supports reliable performance, and reduces wear in heavy-duty and commercial vehicles.

Key Features & Benefits:

• Synthetic blend 15W-40 heavy-duty diesel engine oil for trucks, buses, ag, and construction equipment

• Versatile formulation suitable for a wide range of heavy-duty and commercial vehicles—perfect for mixed fleets

• Special detergent and dispersant package helps keep engines cleaner for more reliable protection and longer engine life

• Protection against oil thickening and deposit build-up in critical engine parts

• Strong protection from wear and deposits to help maintain power and durability

• Improved shear stability and resistance to viscosity loss for consistent engine protection over the drain interval

• Versatile use supports product rationalization for workshops and fleet operators (fewer different oils to stock)

Specifications & Approvals:

Meets:

• API CK-4

• CAT ECF-3

• Cummins CES 20086

• DDC DFS 93K222

• Deutz DQC III-10 LA

• Ford WSS-M2C171-F1

• Mack EOS-4.5

• RVI RLD-4

• Volvo VDS-4.5

Shipping: Items will ship via USPS, FedEx or UPS. We are unable to guarantee a specific carrier, even if one is selected or shown at checkout. We will ship via the carrier that has less days in transit to your destination.

Return Policy:

• Buyer has 30 days from receipt of item to request a return
• Buyer pays for return shipping
• Item must be returned in same condition as received
• In no instance will a return or refund be permitted for a used item
• Upon receipt and inspection by seller, refund will be issued within 2 business days. Refund amount will equal amount paid to seller less the fees associated with the transaction

Cancellation Policy:

• If buyer wants to cancel transaction prior to shipment of order, for any reason, the amount refunded will equal amount paid to seller less the fees associated with the transaction