Jet, Piston Oil Cooler: Description
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
 Courtesy of CHRYSLER GROUP, LLC
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In model year 2013 the piston cooling oil jets are green in color and should not be used in older model year engines.
There are six piston cooling oil jets installed in the engine block. These oil jets are used to cool and lubricate the piston assemblies.