On many 2001-2004 Pathfinders there is usually a oil leak that comes from the oil cooler area. Before you do condemn it to be the oil cooler seals though, make sure it isn’t coming from a source above on the upper parts of the engine that would leak down below and mask itself as a oil cooler seal leak.
There are two orange rubber seals that require replacement (circled in green). The bolt head that holds it together is 17mm in size and can be removed by using a wrench. Oil cooler seals can be picked out with a flat head screw driver. REMEMBER: Clean the grooves where the seals sit for proper sealing with a rag or a paper towel.
Parts cost is about $23.00 CAD at a dealer.
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