For most Chevrolet small-block engines, the two Wix part numbers most commonly recommended are 51515 and 51516, though the exact choice depends on year, vehicle and whether you’re using a long or short filter. Always verify in Wix’s catalog or with your mechanic.
The question matters because the small-block Chevy family spans decades and configurations, and the filter must match thread size, gasket diameter, and oil-flow requirements. Using the right Wix filter helps ensure proper sealing, filtration, and oil pressure.
Common Wix oil filters for the small-block Chevy
Wix’s SBC options are plentiful, but the most frequently cited choices are the 51515 and 51516 series. These sit in the standard-length lineup and align with the 3/4-16 thread common on many GM engines. To be sure, check Wix’s online catalog by entering your vehicle data or engine code.
- WIX 51515
- WIX 51516
Note that while these two are widely used, variations exist for certain model years and performance setups. Always confirm the exact part with Wix’s database or a parts specialist.
How to confirm the right Wix filter for your SBC
To choose the correct Wix filter for your small-block Chevy, follow a simple verification workflow that centers on fitment criteria and official listings.
- Identify your exact engine configuration and year (e.g., 350 small-block, 1985–1999, etc.).
- Measure or confirm the filter’s thread size being used (most SBC oils use 3/4-16).
- Compare the filter’s overall height and base-gasket diameter to your current filter or to the space available in the engine bay.
- Search Wix’s Find-By-Vehicle tool or cross-reference by engine code to pull the recommended filter list for your specific application.
Following these steps reduces the risk of an improper seal or reduced oil flow, particularly on engines with higher oil-pressure demands or performance builds.
Notes on compatibility and maintenance
Even if 51515 and 51516 are common, Wix offers XP and other high-performance variants that may be better suited to certain builds or oil grades. If you’re running synthetic oils, high-mileage engines, or a performance-oriented setup, review Wix’s XP lines and official spec sheets.
Additional considerations
Beyond Wix, cross-reference filters from other brands (AC Delco, Purolator, K&N) if you’re stocking up or following a builder’s specification. Always ensure thread compatibility, filter media, and bypass valve specs align with your engine’s needs.
Summary
For the Chevrolet small-block engine, Wix’s two commonly cited part numbers are 51515 and 51516, with the final choice depending on your exact vehicle, year, and filter length. Always confirm through Wix’s vehicle lookup or by checking the filter you currently use to avoid mismatches and ensure reliable oil filtration.