Dodge RAM 1500 Owner's Manual page 281

Engine oil not designated by the Chrysler or Cummins®
Material Standards and API CJ-4 should not be used, as
engine and exhaust system durability may be compro-
mised. The engine oil filler cap also shows the recom-
mended engine oil viscosity for your engine. For infor-
mation on engine oil filler cap location, refer to "Engine
Compartment" in "Maintaining Your Vehicle" for further
information.
MAINTAINING YOUR VEHICLE 279
Synthetic Engine Oils
You may use synthetic engine oils if the recommended oil
quality requirements are met and the recommended
maintenance intervals for oil and filter changes are
followed.
Materials Added To Engine Oil
The manufacturer strongly recommends against the ad-
dition of any additives (other than leak detection dyes) to
the engine oil. Engine oil is an engineered product and its
performance may be impaired by supplemental addi-
tives.
Engine Oil Filter
Refer to "Fluids, Lubricants, and Genuine Parts" in
"Maintaining Your Vehicle" for further information. The
engine oil filter should be changed at every engine oil
change.
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