Can a Volvo D13 oil cooler be repaired instead of replaced?

No. An internally cracked or perforated oil cooler cannot be reliably repaired and must be replaced. External cleaning of coolant passages does not fix an internal oil-to-coolant leak.

Do I need to flush the engine when replacing the oil cooler?

If oil and coolant had cross-contaminated (milky oil or oily coolant), yes — flush both circuits completely before returning to service. Residual contaminated fluid damages bearings on the oil side and fouls the cooling system.

How do I find the right OE number for my Volvo oil cooler?

Confirm the OE number stamped on your existing cooler and cross-check fitment by engine variant (D11/D13/D16) and year. Volvo uses several superseding numbers, so verify against your engine rather than relying on the model name alone.

Should I replace gaskets and seals when fitting a new oil cooler?

Always. Reusing old gaskets or O-rings is a common cause of repeat leaks. Use a full new seal set and clean all mating surfaces of old gasket material before installing the new cooler.

What coolant and torque should I use?

Use the correct Volvo-specification coolant and tighten fasteners evenly in sequence to the manufacturer's specified torque with a calibrated wrench. Bleed the cooling system afterward to remove air pockets.

Volvo D13/D16 Oil Cooler Replacement: Step-by-Step OE Guide

Step-by-step replacement procedure for the Volvo D13/D16 engine oil cooler, with OE cross-reference, tool list, torque and bleeding notes, and post-repair checks for FH/FM/FMX trucks.

OE Cross-Reference & Trade Supplement

Supplement by the SUMEC Cooling Parts engineering team · Updated 13 June 2026

One distinction worth a minute before ordering: a failing oil cooler on a D-series typically shows oil-in-coolant emulsion or oil pressure loss, while disappearing coolant with white smoke points at the EGR cooler — a different part (see the elimination steps). The oil cooler references below cover D10 through D16; match by the number on the old unit.

Engine	OE number(s)	OE-replacement part
D13 / D16	20700516 / 20742946	D13/D16 Oil Cooler
D11 / D13	22439157 / 20716162	D11/D13 Oil Cooler
D13A / D13C	20810985 / 20810884 / 21359570	D13A/C Oil Cooler
D11L	17458689	D11L Oil Cooler
D11 (legacy reference)	21360064	Volvo Oil Cooler 21360064
D12 12.1L	11110107 / 11033628	D12 Oil Cooler
D12D	11110220	D12D Oil Cooler
D12D / D12E	11110049 / 20749399	D12D/E Oil Cooler
D12A / D12C	8170816 / 20729259 / 8130186	D12A/C Oil Cooler
D10 9.4L	17442386	D10 Oil Cooler
Volvo	20412972	Oil Cooler 20412972

Number not listed? OE lookup. Trade buyers: send OE number(s) and quantity via the quote form — fitment confirmed before quoting.