DL501 Transmission Cooler 2013, used and ready to install. Fits the DL501. Ships fast from the USA.
This is a genuine Audi transmission oil cooler, part number 4G0 317 021 T, made by Behr and taken off a 2013 Audi S7 with the 4.0 TFSI twin-turbo V8 and the seven-speed DL501 (0B5) S tronic. It is used, with no visible cracks or broken mounting points. If your C7 S6, S7, A6 or A7 has a seeping or cracked transmission cooler, coolant in the gearbox fluid, or fluid temperatures that climb under hard driving, this is the factory part rather than an aftermarket copy.
The DL501 runs two oil circuits that never mix. One holds roughly 7.5 liters of automatic transmission fluid that feeds the mechatronic unit, applies the two wet clutches (K1 for the odd gears, K2 for the even gears and reverse) and carries their heat away. The other holds hypoid gear oil for the gear sets and differentials. The cooler serves the first circuit. It is a stacked-plate heat exchanger mounted at the transmission, with coolant tubes on each end, so heat picked up by the clutch fluid passes into the engine cooling system instead of building in the sump.
That matters more on a dual-clutch box than on a conventional automatic. The clutches slip on purpose during every launch and every crawl in traffic, and the same fluid that cools them also works the solenoids and pressure regulator in the mechatronic. Hot, oxidized fluid wears that hydraulic side faster, which is how a cooling problem turns into a shift-quality problem.
Pressure-test the cooling system cold and watch the cooler and its tube joints. Then pull a fluid sample from the transmission: clear, red-amber fluid means the core is sealed; cloudy fluid or droplets mean the core has leaked internally, and the clutch fluid has to be flushed and the mechatronic checked before the new cooler goes in. With a scan tool, log clutch and fluid temperatures on a road test. Our DSG overheating guide explains which temperature readings to watch and what drives them up, and the DSG line pressure testing guide helps separate a heat problem from a pressure regulator or valve body problem.
The part was removed from a 2013 S7 4.0T with the DL501. Audi used the 4G0 317 021 T number on C7-platform A6, S6 and A7 models from roughly 2011 to 2015, and has since superseded it with 4G0 317 021 AF. Those C7 cars came with more than one transmission depending on engine and market, so the model name alone is not proof of fit. Read the part number stamped on your old cooler and match it exactly, or send us your year and VIN and we will check it. It may also suit other VW Group cars with this cooler, but only a part-number match settles that. Browse the rest of our dual-clutch parts on the DSG and S tronic parts page.
Refilling the clutch-fluid circuit after a cooler swap goes much easier with the 0B5 S tronic fill hand pump kit. If the coolant leak reached the mechatronic and you are going deeper, the 0B5 sensor module remover kit is the tool for that job.
| Fits | DL501 2013 |
| Part type | Transmission Cooler |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It came off a 2013 S7 4.0T with the DL501 S tronic. The S6 shares the C7 platform, but Audi used several cooler numbers across these cars. Match 4G0 317 021 T against the number on your old cooler, or send us your VIN and we will confirm.
It is a used genuine Audi part made by Behr, removed from a running car, with normal wear and no visible cracks or broken mounts. The photos show the exact part you get.
That combination is the classic sign of an internal cooler leak. Replace the cooler, flush the transmission fluid more than once, and have the mechatronic checked, since coolant in the clutch fluid harms solenoids and clutch facings.
Audi superseded it with 4G0 317 021 AF around late 2014. If your car carries the AF number, the older T part was its predecessor, but confirm with your VIN before ordering.
Not for the cooler itself. If fluid was drained or contaminated, run the S tronic basic settings and clutch adaptations afterward, with the fluid between 40 and 100 C.
