Quick answer:
The John Deere STX38 mower primary engine air filter part number found is GY20574. Cross-reference filters include WIX 49010; NAPA 49010; Baldwin PA2020; Donaldson P181195; more listed below.
Primary air filterGY20574
Cross-referenceWIX 49010
Engine power13 hp
John Deere STX38 Air Filter Specs
| Primary air filter part number | GY20574 |
|---|---|
| Secondary / safety air filter | GY20574 |
| Pre-filter | M88571 |
| Cross-reference filters | WIX 49010; NAPA 49010; Baldwin PA2020; Donaldson P181195; FRAM CA10112; Stens 102-052 |
| Number of air filter elements | 3 elements (primary, secondary, pre-filter) |
| Engine model | Kohler |
| Engine horsepower | 13 hp |
| Engine displacement | 24.3 cu in (0.4 L) |
John Deere STX38 Air Filter Charts
Engine horsepower
Engine displacement
John Deere STX38 Air Filter FAQ
| What air filter does the John Deere STX38 use? | The primary engine air filter part number found for the John Deere STX38 is GY20574. |
|---|---|
| What air filter cross-references fit the John Deere STX38? | Cross-reference filters found for the John Deere STX38 include WIX 49010; NAPA 49010; Baldwin PA2020; Donaldson P181195; FRAM CA10112; Stens 102-052. |
| Can I use an aftermarket air filter on the John Deere STX38? | The John Deere STX38 has 6 cross-reference filters listed, starting with WIX 49010. Use them as aftermarket leads, not as a replacement for checking the original part number GY20574. |
| How many air filter elements are listed for the John Deere STX38? | This page lists a primary filter, a safety filter and a pre-filter: 3 elements (primary, secondary, pre-filter). Replace each only with the matching part number for that position. |
| Why include engine specs on a John Deere STX38 air filter page? | For the John Deere STX38, the engine specs found are 13 hp, 24.3 cu in (0.4 L). This is useful context when comparing similar models, but not a substitute for checking the filter number GY20574. |
| Should I order the John Deere STX38 air filter by size or part number? | The OEM-style number GY20574 should be the main lookup value for the John Deere STX38; the cross-reference numbers are useful when shopping WIX, Baldwin, Donaldson or similar brands. |
| What should I confirm before buying a John Deere STX38 air filter? | For the John Deere STX38, confirm GY20574 against the parts manual, then use the cross-reference list only after the OEM number matches. |
Official information note
Air filter fit can change by engine, serial number, production year and air-cleaner housing. Check the operator manual, parts manual and official deere.com website before buying or fitting an air filter.

