NAPA Gold 1138 vs MANN-FILTER W 920/51: Oil Filter Compatibility
Compare NAPA Gold 1138 and MANN-FILTER W 920/51 oil filters by compatibility, dimensions, thread size, gasket fit, bypass valve, anti-drainback valve status, and match confidence. Use this comparison as a fitment review, not as an automatic substitution guarantee. Both use a 3/4-16 thread.
Quick verdict
Both use a 3/4-16 thread.
- Thread size is the first hard-fit check for any comparison of spin-on filters.
- Gasket OD and gasket ID are the most important seal-related dimensions.
- Height differences can matter for clearance even when thread and gasket fit appear close.
- Bypass and anti-drainback differences may be important, depending on the application.
NAPA Gold 1138 and MANN-FILTER W 920/51 specifications
How matching is scored| Specification | NAPA Gold 1138 | MANN-FILTER W 920/51 |
|---|---|---|
| Thread size | 3/4-16 | 3/4-16 |
| Gasket OD | 70.1 mm | 71.5 mm |
| Gasket ID | 62.5 mm | 62.5 mm |
| Can OD | 93.04 mm | 93.19 mm |
| Height | 96.82 mm | 95.81 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 15 - 22 | 8 - 11 |
| Anti-drainback valve | No | Yes |
What matters in this specific comparison
Thread size matches: both are 3/4-16.
Gasket OD differs by 1.4 mm (NAPA Gold 1138: 70.1 mm, MANN-FILTER W 920/51: 71.5 mm).
Gasket ID is identical at 62.5 mm.
NAPA Gold 1138 is 1 mm taller (NAPA Gold 1138: 96.82 mm, MANN-FILTER W 920/51: 95.81 mm) -- check clearance before substituting.
Can OD differs by 0.1 mm (NAPA Gold 1138: 93.04 mm, MANN-FILTER W 920/51: 93.19 mm).
Both open their bypass valve in a comparable range: NAPA Gold 1138 at 15-22 psi, MANN-FILTER W 920/51 at 8-11 psi -- these ranges do not overlap.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.