The Air Filter is a core filtration component of the engine intake system. The SAYING SY-00015 Air Filter (corresponding to SogefiPRO SAF1066) carries original OE number 13 71 7 521 033; 13 71 7 521 038, with dimensions of 295*231*46 mm. It fits BMW applications, mainly covering the models listed below. This part cross-references to aftermarket equivalents such as MANN-FILTER C 30 139, MAHLE LX 3977; LX 944, FRAM CA10022, CHAMPION AF3965, HENGST E720L, BOSCH 0986AF2836, WIX WA9492, serving the aftermarket replacement and maintenance demand for Air Filter. Manufactured under the Sogefi authorized system, SAYING delivers OE-equivalent quality with multi-brand cross coverage, helping service channels cover a wider vehicle range with lower inventory.
| Brand | Part No. |
|---|---|
| BMW (OE) | 13 71 7 521 033; 13 71 7 521 038 |
| SAYING | SY-00015 |
| Sogefi | SAF1066 |
| MANN-FILTER | C 30 139 |
| MAHLE / KNECHT | LX 3977; LX 944 |
| FRAM | CA10022 |
| CHAMPION | AF3965 |
| HENGST | E720L |
| BOSCH | 0986AF2836 |
| WIX | WA9492 |