RAM CHASSIS CAB 2015 Owner's Manual page 556

554 MAINTAINING YOUR VEHICLE
Component
Engine Oil – 6.4L Engine
Engine Oil Filter – 5.7L/6.4L Engine
Spark Plugs – 5.7L/6.4L Engine
Fuel Selection – 5.7L/6.4L Engine
Fluid, Lubricant, or Genuine Part
For best performance and maximum protection under
all types of operating conditions, the manufacturer
only recommends full synthetic engine oils that meet
the American Petroleum Institute (API) categories of
SN. The manufacturer recommends the use of Penn-
zoil Ultra™ 0W-40 or equivalent MOPAR® engine oil
meeting the requirements of Chrysler Material Stan-
dard MS-12633 for use in all operating temperatures.
We recommend you use MOPAR® Engine Oil Filters.
We recommend you use MOPAR® Spark Plugs.
87 Octane Acceptable - 89 Octane Recommended.