fact_checkQuick answer
2021 Cummins B6.7 Oil Capacity
Most 2021 Cummins B6.7 applications use 16-19.5 qt with a new oil filter. Check the table below to match your exact vehicle before filling.
With filter
16-19.5 qt
Recommended oil
Cummins CES 20086 / API CK-4
Typical viscosity
10W-30 or 15W-40
Oil Capacity by Year and Application
All numbers below are with a new oil filter.
YearsApplicationWith filterLitersRecommended oil
2021-2026B6.7 with standard oil pan16 qt15.1 LCummins CES 20086 / API CK-4
2021-2026B6.7 with high-capacity oil pan19.5 qt18.5 LCummins CES 20086 / API CK-4
Start a little below the listed amount, then use the dipstick to top off. Check the owner manual if your vehicle has a different chassis, duty rating, or special package.
Common Questions
How many quarts does a 2021 Cummins B6.7 take?
Most 2021 Cummins B6.7 applications take 16-19.5 qt with a new oil filter. Match your exact vehicle row before filling.
Does the 2021 Cummins B6.7 oil capacity include the filter?
Yes. The capacity shown here is the with-filter amount for a normal oil and filter change.
What oil should I use in a 2021 Cummins B6.7?
2021 Cummins B6.7 applications commonly list 10W-30 or 15W-40. Use the recommended oil shown for your matching application and confirm it in the owner manual.
Why might my 2021 Cummins B6.7 use a different amount?
A different chassis, oil pan, duty rating, or special package can change the published refill amount. Use the row that matches your vehicle.