Silverado 3500 2WD V8-6.6L DSL Turbo (2006)
12. Remove the oil cooler adapter nuts from the flywheel housing.
13. Remove the oil cooler adapter bolts from the oil filter adapter/oil cooler.
14. Remove the oil cooler adapter.
15. Remove the oil filter adapter/oil cooler bolts.
16. Remove the oil filter adapter/oil cooler.
17. Remove and discard the oil filter adapter/oil cooler O-ring seals.