Cummins recommends using either a 50/50 mixture of distilled water and fully formulated antifreeze, or fully formulated coolant when filling the cooling system.

Dec 11, 2025 · Maintaining your Cummins X15 engine properly is non-negotiable for its lifespan and power, and the right engine oil is at the heart of that care. This guide cuts through the …

Apr 15, 2025 · For all engines, Cummins recommends regular used oil analysis and provides strict contamination limits for soot, fuel dilution, and metals. Ignoring these thresholds or using …

Jun 21, 2009 · For the Cummins 2017 X15 engine offering, FA-4 oils will provide an added fuel economy benefit; however, the standard recommendation will be CK-4, due in part to the …

For all oil drain interval and maintenace interval recommendations, consult the appropriate Owners/Operation and Maintenance Manual for the recommendation based on the particular …

Cummins recommends the use of either CES 20086(API CK-4)/CES 20087(API FA-4) approved oils in their GHG ‘17 X15 and new GHG ‘21 X12 and X15 diesel engines.

5 days ago · You should change the oil in your Cummins X15 engine every 15,000 miles or roughly every 6 months, whichever comes first. If you operate under severe conditions like …

For normal engine operation, Cummins recommends the use of a high quality 15W40 or 10W30 heavy duty engine oil that meets the requirements of Cummins® 20086 specification (API …

A 15W-40 oil is the best all-around option, but in extremely harsh cold winter conditions, you can use a 10W-30 if needed. Please let me know if you have any questions.

Mar 24, 2025 · Proper maintenance and regular oil changes are crucial for the longevity and performance of any engine, including the Cummins X15. Here are the engine oil specifications …