Premium Guard PG4612 vs Baldwin B1421: Oil Filter Compatibility
Compare Premium Guard PG4612 and Baldwin B1421 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.
Quick verdict
These filters may still be worth comparing, but thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements should be reviewed before substitution.
- 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.
Premium Guard PG4612 and Baldwin B1421 specifications
How matching is scored| Specification | Premium Guard PG4612 | Baldwin B1421 |
|---|---|---|
| Thread size | M20x1.5 | M20x1.5 |
| Gasket OD | 62.74 mm | 64 mm |
| Gasket ID | 55.37 mm | 54.1 mm |
| Can OD | 65.53 mm | 77 mm |
| Height | 76.45 mm | 87.3 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 17 | 14 |
| Anti-drainback valve | Yes | Yes |
What matters most in this comparison?
Thread match: A direct spin-on substitute starts with the same thread size. If the threads differ, the comparison stops there.
Gasket fit: Even when thread size matches, the gasket outside diameter and inside diameter still control whether the filter seals safely against the mounting surface.
Height difference: Small height differences may be acceptable, but longer filters can create clearance problems in tighter installations.
Valve behavior: Bypass and anti-drainback differences can matter in real-world service, especially on cold start or in applications sensitive to oil drain-back.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.