Sinclair OEMs have advanced engines design to improve fuel economy, reduce emissions and extend oil drain intervals. And Sinclair has innovated and improved engine oil technology to stay in front of these changes.

Sinclair Full Synthetic Heavy Duty 5W-40 CK-4 Diesel Engine Oil gives you unsurpassed protection and better performance, especially in very cold or hot temperatures.

• Sinclair’s best performance for reliable starts even in extreme cold conditions.
• Outstanding extended drain intervals.
• Improved fuel economy.
• Meets or exceeds the OEM requirements.

Innovation You Can Count On

Sinclair Full Synthetic 5W-40 CK-4 is a technologically advanced lubricant that provides powerful, long-lasting, high-performing protection to manage friction and reduce metal-to-metal contact–giving you outstanding protection for longer engine life.

Sinclair Full Synthetic Heavy Duty Diesel Engine Oil: Performance You'll Notice

Specifically formulated to deliver you the following benefits:

Applications

• This product and grade is a fuel economy and mixed fleet engine oil recommended for naturally aspirated and turbocharged four-stroke diesel engines in which the API CK-4 service categories are recommended. It is formulated for engines operating under severe service and a wide range of cold and hot temperatures.
• It is backward compatible for CJ-4 and older API service categories.
• Approved by or meets requirements of major OEMs such as Cummins, Detroit Diesel, Mack/Volvo, Paccar, Navistar, Caterpillar, and others.