CUMMINS QSB5.9 Marine Gear Oil Cooler for Sale Oil Cooler is a marine gear cooler in good working order It's a take-off from an engine with 3,800-hours on the meter Engine rated at 330-HP CUMMINS Part Number is 3975986 CUMMINS new price around $900.00 Will-fit oil coolers this size are more than $400.00 Dimensions are shown on the attached sheet