For the E320 CDI W211/S211 OM642.920 V6, MANN lists HU 821 x oil filters, C 25 004 left-side and C 27 006 right-side engine air filters. Its current catalogue also lists C 27 000-2 for this application. Cabin selection needs the steering-side check; diesel fuel filters have a water-sensor variant.
Coverage: E320 CDI V6 W211 saloon and S211 estate with the 2,987 cc OM642.920 engine, 165 kW / 224 hp. MANN catalogues this application from May 2005 to December 2009. These are application dates, not UK registration cut-offs. Earlier OM648 straight-six, petrol E320, BlueTEC and 4MATIC applications are outside this guide.
Parts references for the V6 application
| Filter | Manufacturer reference | Condition |
|---|---|---|
| Engine oil | HU 821 x | OM642.920 V6; not the earlier OM648 oil filter |
| Engine air, left | C 25 004 | Left-side position |
| Engine air, right | C 27 006 | Right-side position |
| Current air reference also listed | C 27 000-2 | Confirm supplied contents cover the required positions |
| RHD cabin, biofunctional option | FP 3172/1 | W/S211 right-hand-drive catalogue branch |
| Diesel fuel | WK 820/1 | Match actual equipment and connections |
| Fuel-filter equipment variant | WK 842/23 x | Optional water-sensor connection |
The printed MANN table and current product pages provide application evidence. They do not establish which items are due at the next service or guarantee the contents of a retailer’s bundle.
Why an “E320 CDI service kit” needs checking
The earlier OM648 straight-six is a different application. For example, MANN lists HU 721/2 x for that engine, while the V6 uses HU 821 x. A kit title covering a wide range of years can hide that distinction.
Check every listed reference rather than accepting the vehicle badge in the headline. Send vehicle details privately to the supplier when necessary, and resolve a conflict between its listing and the engine-specific catalogue before ordering.
Engine air filters: account for both positions
MANN’s individual C 25 004 and C 27 006 pages identify left and right respectively for E320 CDI V6 W/S211. Buying two identical elements is not the same as matching both listed positions.
The current C 27 000-2 product page also names the exact OM642.920, 165 kW application. When comparing that reference with separate elements, confirm the seller’s supplied contents and application. This guide does not claim a universal supersession or infer pack contents from a photograph.
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Search Amazon for MANN C 27 000-2 air filtersThe link is a product-reference search. Confirm the full reference and package; search results can include other parts and incomplete bundles.
Oil filter: HU 821 x
MANN’s current HU 821 x catalogue explicitly lists E320 CDI V6 W/S211, OM642.920. Check the complete reference and supplied seals on the individual listing. Keep the oil specification as a separate decision; the E320 CDI OM642 oil guide covers the documented capacity and DPF approvals.
You can also browse oil filters on eBay. Add or select the exact vehicle, then confirm the individual product reference and compatibility details.
This graphic opens an affiliate category, not a pre-verified list of filters for your car.
Cabin filter: retain the RHD suffix
MANN’s printed W/S211 all-models cabin section lists FP 3172/1 as a biofunctional right-hand-drive option. Its current product description also specifies right-hand drive. The separate FP 3172 entry is left-hand drive; keep the /1 suffix when comparing products for a UK RHD car.
Search Amazon for MANN FP 3172/1 cabin filtersThe catalogue includes other media and equipment branches, so this is a documented buying option rather than a claim that every W211 cabin filter is identical. Do not transfer a left-hand-drive fitting guide to a right-hand-drive car without checking the arrangement.
Fuel filter: identify the water-sensor arrangement
The exact V6 catalogue row lists WK 820/1 and an optional branch for WK 842/23 x with a water-sensor connection. The latter condition is repeated on MANN’s current product page.
Have the actual connection matched before buying; do not treat the references as freely interchangeable. A shared OM642 description or a visually similar canister is insufficient. Keep the full confirmed reference on the service invoice.
When should these filters be changed?
Use the applicable service information, dated renewal history and any justified inspection findings. Application dates describe the catalogue range, not replacement intervals. Our E320 CDI V6 maintenance guide separates service planning from a complete-kit shopping list.
Find more models in the Mercedes maintenance hub. For a separate fault-reading or tool question, browse our Mercedes diagnostic scanner guides and check the exact diesel vehicle and required function.
Manufacturer evidence
- MANN 2024–26 catalogue, printed pages 215–216 / PDF pages 271–272: exact V6, earlier straight-six, cabin and fuel branches.
- MANN C 25 004, C 27 006 and C 27 000-2: air-filter applications.
- MANN HU 821 x and FP 3172/1: oil application and RHD cabin description.
- MANN WK 820/1 and WK 842/23 x: diesel filter and equipment variant.
Research checked 20 October 2026. Match the actual engine and equipment before purchase.
