MANN lists C 3698/3-2 for engine air filtration and HU 718/5 x for the covered CLK320 M112.955 oil-filter application. NGK UK’s catalogue lists PFR5G-11, stock number 2647, quantity 12 for the 209-series CLK320. Cabin filters depend on steering side and climate-control equipment.
Coverage: petrol CLK320 C209 coupé and A209 cabriolet with the 3,199 cc M112.955 V6, model types 209.365/465. The older C208/A208 CLK320, CLK320 CDI, CLK350 and other engines require separate specifications.
Identify the petrol 209-series car first
MANN names model types 209.365/465, M112.955, 3,199 cc and 160 kW/218 hp, with application dates May 2002–June 2005. These are catalogue dates; confirm vehicle details rather than relying on the registration year.
The older 208-series CLK320 and later CLK320 CDI have separate engine applications. A kit advertised simply for “CLK320” needs a closer check before any of its contents can be accepted.
Engine air filter: C 3698/3-2
MANN’s current air-filter page explicitly lists the M112.955 CLK320 209.365/465. Keep the complete C 3698/3-2 reference when comparing products.
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Search Amazon for MANN C 3698/3-2 air filtersThe link opens a search. Check the chosen item’s complete reference, application and supplied contents. Do not decide how many elements are included from a product photograph or shortened title.
Oil filter: HU 718/5 x
The current MANN oil-filter page identifies HU 718/5 x for the same named application. Do not shorten it to a generic HU 718 reference. Preserve the slash, number and suffix when checking a supplier’s item.
For eBay browsing, add or select the exact car and inspect the individual listing’s full reference and compatibility details. If these disagree, resolve the application with the supplier before ordering.
The graphic is an affiliate category link. A saved vehicle does not establish that every displayed item fits. See our CLK320 oil guide for the separate 8-litre change reference and oil-approval checks.
Cabin filters: identify THERMATIC or THERMOTRONIC
MANN’s printed A/C209 table separates climate-control equipment and steering side. A UK registration does not prove right-hand drive, especially on an imported car.
| Equipment / steering side | Catalogue reference | Filter type |
|---|---|---|
| THERMATIC, right-hand drive | CUK 3461/1 | Activated carbon |
| THERMATIC, left-hand drive | CUK 3461 | Activated carbon |
| THERMOTRONIC, right-hand drive | CU 3461/1 | Particulate |
| THERMOTRONIC, left-hand drive | CU 3461 | Particulate |
| THERMOTRONIC activated-carbon filtration | CUK 20 000-2 | Separate activated-carbon entry |
Confirm the fitted climate system through the vehicle’s equipment information. The THERMOTRONIC entries should not be treated as a choice of any single filter to replace every element.
For a confirmed right-hand-drive THERMATIC car
MANN’s current CUK 3461/1 page describes the RHD filter and lists the M112.955 CLK320 with the THERMATIC condition. Once those conditions match, use the specific search below.
Search Amazon for MANN CUK 3461/1 cabin filtersRetain the /1 suffix and check the actual listing. If the car has THERMOTRONIC, ask the supplier or workshop to identify the required elements from that system’s branches instead of ordering solely by badge.
Spark plugs: budget for 12
| NGK UK 2024 entry | Reference |
|---|---|
| CLK320, 209 series, M112.955 V6 | PFR5G-11 |
| NGK stock number | 2647 |
| Number of plugs listed | 12 |
NGK gives an April 2002–August 2005 range for this row. It differs slightly from MANN’s filter dates, so use the exact engine application rather than turning either range into a UK registration cut-off.
Check whether a quoted price covers one plug, six or all twelve. A V6 description is not a reason to order six for this application. Keep the reference and quantity fitted on the invoice.
The catalogue supports the named application, not a universal fitting torque, replacement interval or procedure. If replacement is being proposed to cure poor running, distinguish fault diagnosis from scheduled renewal.
Fuel filter and service-kit contents
MANN’s printed CLK320 M112.955 row also lists WK 720 for fuel filtration. Treat that as an application reference; it does not establish that renewal is due at every A or B service.
Compare the applicable maintenance requirements and actual renewal history before adding work. The CLK320 maintenance guide explains how to request an itemised quote and keep each operation identifiable.
Explore the Mercedes maintenance hub. For warning lamps, gearbox or cabriolet roof investigation, use our CLK W209 diagnostic scanner guide.
Sources and application limits
- MANN C 3698/3-2 and MANN HU 718/5 x: current exact model/engine applications.
- MANN CUK 3461/1 and MANN CUK 20 000-2: equipment conditions.
- MANN 2024–26 catalogue, printed page 212 / PDF page 268: full steering-side, climate and fuel-filter branches, visually checked.
- NGK UK 2024, printed page 46 / PDF page 48: M112.955 plug reference and quantity, visually checked.
Checked 20 October 2026. These references support the stated applications, not a universal renewal interval or installation procedure.
