WIX 51661 vs Champ PH2840: Oil Filter Compatibility
Compare WIX 51661 and Champ PH2840 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 M20x1.5 thread.
Quick verdict
Both use a M20x1.5 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.
WIX 51661 and Champ PH2840 specifications
How matching is scored| Specification | WIX 51661 | Champ PH2840 |
|---|---|---|
| Thread size | M20x1.5 | M20x1.5 |
| Gasket OD | 63 mm | 62.7 mm |
| Gasket ID | 55.1 mm | 54.6 mm |
| Can OD | 68.3 mm | 74.68 mm |
| Height | 86.4 mm | 78.99 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 13 - 19 | 14 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 0.3 mm (WIX 51661: 63 mm, Champ PH2840: 62.7 mm).
Gasket ID differs by 0.5 mm (WIX 51661: 55.1 mm, Champ PH2840: 54.6 mm).
WIX 51661 is 7.4 mm taller (WIX 51661: 86.4 mm, Champ PH2840: 78.99 mm) -- check clearance before substituting.
Can OD differs by 6.4 mm (WIX 51661: 68.3 mm, Champ PH2840: 74.68 mm).
Both open their bypass valve in a comparable range: WIX 51661 at 13-19 psi, Champ PH2840 at 14-14 psi.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.