To remove the oil cooler, it is first necessary to drain the coolant and engine oil, being careful to handle any fluid spillage. For models with the 85kW engine remove the diesel particulate filter. Then undo the bolts or studs to remove the oil cooler from the front of the oil filter housing, and reclaim the O-ring seals. When refitting, install new O-ring seals in the recesses of the oil filter housing and reattach the cooler, tightening the bolts securely. Remove the diesel particulate filter, if needed, reinstall the filter. Finally, refill or top up the cooling system and engine oil level as necessary, start the engine, and check the oil cooler for any indication of leakage.